Photographing optical lens system, image capturing unit and electronic device

ABSTRACT

A photographing optical lens system includes six lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. Each of the six lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The first lens element has positive refractive power. The second lens element has negative refractive power. The sixth lens element has negative refractive power. At least one lens surface of at least one lens element of the photographing optical lens system has at least one critical point in an off-axis region thereof.

RELATED APPLICATIONS

This application claims priority to Taiwan Application 108132276, filedon Sep. 6, 2019, which is incorporated by reference herein in itsentirety.

BACKGROUND Technical Field

The present disclosure relates to a photographing optical lens system,an image capturing unit and an electronic device, more particularly to aphotographing optical lens system and an image capturing unit applicableto an electronic device.

Description of Related Art

With the development of semiconductor manufacturing technology, theperformance of image sensors has been improved, and the pixel sizethereof has been scaled down. Therefore, featuring high image qualitybecomes one of the indispensable features of an optical system nowadays.

Furthermore, due to the rapid changes in technology, electronic devicesequipped with optical systems are trending towards multi-functionalityfor various applications, and therefore the functionality requirementsfor the optical systems have been increasing. However, it is difficultfor a conventional optical system to obtain a balance among therequirements such as high image quality, low sensitivity, a properaperture size, miniaturization and a desirable field of view.

SUMMARY

According to one aspect of the present disclosure, a photographingoptical lens system includes six lens elements. The six lens elementsare, in order from an object side to an image side, a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element. Each of the sixlens elements has an object-side surface facing toward the object sideand an image-side surface facing toward the image side.

The first lens element has positive refractive power. The second lenselement has negative refractive power. The image-side surface of thefifth lens element is concave in a paraxial region thereof. The sixthlens element has negative refractive power. At least one lens surface ofat least one lens element of the photographing optical lens system hasat least one critical point in an off-axis region thereof.

When an Abbe number of the second lens element is V2, an Abbe number ofthe third lens element is V3, an Abbe number of the fourth lens elementis V4, a central thickness of the first lens element is CT1, a centralthickness of the second lens element is CT2, a central thickness of thethird lens element is CT3, a central thickness of the fifth lens elementis CT5, a central thickness of the sixth lens element is CT6, an axialdistance between the second lens element and the third lens element isT23, an axial distance between the fifth lens element and the sixth lenselement is T56, and half of a maximum field of view of the photographingoptical lens system is HFOV, the following conditions are satisfied:

30.0<V2+V3+V4<90.0;

1.00<CT1/(CT2+T23+CT3);

30.0 [deg.]<HFOV; and

(CT5+CT6)/T56<10.0.

According to another aspect of the present disclosure, a photographingoptical lens system includes six lens elements. The six lens elementsare, in order from an object side to an image side, a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element. Each of the sixlens elements has an object-side surface facing toward the object sideand an image-side surface facing toward the image side.

The first lens element has positive refractive power, and the image-sidesurface of the first lens element is convex in a paraxial regionthereof. The second lens element has negative refractive power. Thesixth lens element has negative refractive power. At least one lenssurface of at least one lens element of the photographing optical lenssystem has at least one critical point in an off-axis region thereof.

When an Abbe number of the second lens element is V2, an Abbe number ofthe third lens element is V3, an Abbe number of the fourth lens elementis V4, a central thickness of the first lens element is CT1, a centralthickness of the second lens element is CT2, a central thickness of thethird lens element is CT3, a central thickness of the fourth lenselement is CT4, a central thickness of the fifth lens element is CT5, anaxial distance between the second lens element and the third lenselement is T23, and half of a maximum field of view of the photographingoptical lens system is HFOV, the following conditions are satisfied:

30.0<V2+V3+V4<90.0;

1.00<CT1/(CT2+T23+CT3);

30.0 [deg.]<HFOV; and

CT5/CT4<1.80.

According to another aspect of the present disclosure, a photographingoptical lens system includes six lens elements. The six lens elementsare, in order from an object side to an image side, a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element. Each of the sixlens elements has an object-side surface facing toward the object sideand an image-side surface facing toward the image side.

The first lens element has positive refractive power. The second lenselement has negative refractive power. The sixth lens element hasnegative refractive power. At least one lens surface of at least onelens element of the photographing optical lens system has at least onecritical point in an off-axis region thereof.

When an Abbe number of the second lens element is V2, an Abbe number ofthe third lens element is V3, an Abbe number of the fourth lens elementis V4, a central thickness of the first lens element is CT1, a centralthickness of the second lens element is CT2, a central thickness of thethird lens element is CT3, a central thickness of the fourth lenselement is CT4, a central thickness of the fifth lens element is CT5, anaxial distance between the second lens element and the third lenselement is T23, and half of a maximum field of view of the photographingoptical lens system is HFOV, the following conditions are satisfied:

30.0<V2+V3+V4<90.0;

1.00<CT1/(CT2+T23+CT3);

35.0 [deg.]<HFOV; and

CT5/CT4<1.35.

According to another aspect of the present disclosure, an imagecapturing unit includes one of the aforementioned photographing opticallens systems and an image sensor, wherein the image sensor is disposedon an image surface of the photographing optical lens system.

According to another aspect of the present disclosure, an electronicdevice includes the aforementioned image capturing unit.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 10thembodiment;

FIG. 21 is a perspective view of an image capturing unit according tothe 11th embodiment of the present disclosure;

FIG. 22 is one perspective view of an electronic device according to the12th embodiment of the present disclosure;

FIG. 23 is another perspective view of the electronic device in FIG. 22;

FIG. 24 is a block diagram of the electronic device in FIG. 22;

FIG. 25 shows a schematic view of inflection points and critical pointsof the lens elements according to the 1st embodiment of the presentdisclosure; and

FIG. 26 shows a schematic view of Y11, Y62, Yc51, Yc52, Yc62, ET1 andET2 according to the 1st embodiment of the present disclosure.

DETAILED DESCRIPTION

A photographing optical lens system includes six lens elements. The sixlens elements are, in order from an object side to an image side, afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element and a sixth lens element. Eachof the six lens elements of the photographing optical lens system has anobject-side surface facing toward the object side and an image-sidesurface facing toward the image side.

The first lens element has positive refractive power. Therefore, it isfavorable for reducing the total track length. The image-side surface ofthe first lens element can be convex in a paraxial region thereof.Therefore, it is favorable for adjusting the shape of the first lenselement so as to adjust the refractive power of the first lens elementand reduce the outer diameter of the first lens element. The object-sidesurface of the first lens element can be convex in a paraxial regionthereof. Therefore, it is favorable for adjusting incident angles oflight from various regions within the field of view on the first lenselement so as to obtain a wide angle configuration.

The second lens element has negative refractive power. Therefore, it isfavorable for balancing aberrations such as spherical aberrationgenerated due to the miniaturization of the photographing optical lenssystem.

The object-side surface of the third lens element can be convex in aparaxial region thereof. Therefore, it is favorable for adjusting thetravelling direction of light so as to reduce the object-side outerdiameter of the photographing optical lens system. The image-sidesurface of the third lens element can be concave in a paraxial regionthereof. Therefore, it is favorable for adjusting the surface shape ofthe third lens element so as to correct aberrations such as astigmatism.

The object-side surface of the fourth lens element can be concave in aparaxial region thereof. Therefore, it is favorable for adjusting thesize distribution of the object side and image side of the photographingoptical lens system. The image-side surface of the fourth lens elementcan be convex in a paraxial region thereof. Therefore, it is favorablefor adjusting the refraction direction of light from the fourth lenselement so as to increase illuminance.

The image-side surface of the fifth lens element can be concave in aparaxial region thereof. Therefore, it is favorable for the surfaceshape of the fifth lens element to be in collaboration with that of thesixth lens element so as to correct off-axis aberrations. Theobject-side surface of the fifth lens element can be convex in aparaxial region thereof. Therefore, it is favorable for the surfaceshape of the fifth lens element to be in collaboration with that of thefourth lens element so as to correct off-axis aberrations.

The sixth lens element has negative refractive power. Therefore, it isfavorable for balancing the refractive power distribution of thephotographing optical lens system so as to correct aberrations. Theimage-side surface of the sixth lens element can be concave in aparaxial region thereof. Therefore, it is favorable for adjusting theback focal length.

According to the present disclosure, at least one of the object-sidesurface and the image-side surface of at least one lens element of thephotographing optical lens system has at least one critical point in anoff-axis region thereof. Therefore, it is favorable for increasing theshape variation of the lens element(s) so as to miniaturize thephotographing optical lens system and improve peripheral image quality.Moreover, at least one of the object-side surface and the image-sidesurface of each of at least two lens elements of the photographingoptical lens system can have at least one critical point in an off-axisregion thereof. Moreover, the object-side surface of the fifth lenselement can have at least one critical point in an off-axis regionthereof. Therefore, it is favorable for adjusting the incident angle oflight on the fifth lens element so as to reduce stray light. Moreover,the image-side surface of the fifth lens element can have at least onecritical point in an off-axis region thereof. Therefore, it is favorablefor adjusting the surface shape of the fifth lens element so as tocorrect off-axis aberrations and enlarging the image surface. Moreover,when a vertical distance between the critical point on the object-sidesurface of the fifth lens element and an optical axis is Yc51, and avertical distance between the critical point on the image-side surfaceof the fifth lens element and the optical axis is Yc52, the at least onecritical point in the off-axis region of the object-side surface and theat least one critical point in the off-axis region of the image-sidesurface of the fifth lens element can satisfy the following condition:0.70<Yc51/Yc52<1.4. Therefore, it is favorable for further adjusting thesurface shape of the fifth lens element so as to improve peripheralimage quality. Moreover, the image-side surface of the sixth lenselement can have at least one critical point in an off-axis regionthereof. Therefore, it is favorable for adjusting the incident angle oflight on the image surface so as to improve the response efficiency ofthe image sensor and increase peripheral illuminance of the imagesurface. Moreover, when a vertical distance between the critical pointon the image-side surface of the sixth lens element and the optical axisis Yc62, and a maximum effective radius of the image-side surface of thesixth lens element is Y62, the at least one critical point in theoff-axis region of the image-side surface of the sixth lens element cansatisfy the following condition: 0.15<Yc62/Y62<0.65. Therefore, it isfavorable for further improving peripheral image quality, improving theresponse efficiency of the image sensor and increasing peripheralilluminance of the image surface. Please refer to FIG. 25 and FIG. 26.FIG. 25 shows a schematic view of critical points C of the second lenselement 120, the third lens element 130, the fifth lens element 150 andthe sixth lens element 160 according to the 1st embodiment of thepresent disclosure, and FIG. 26 shows a schematic view of Yc51, Yc52,Y62 and Yc62 according to the 1st embodiment of the present disclosure.

According to the present disclosure, at least one of the object-sidesurface and the image-side surface of at least one lens element of thephotographing optical lens system can have at least one inflectionpoint. Therefore, it is favorable for increasing the shape variation ofthe lens element(s) so as to miniaturize the photographing optical lenssystem and improve image quality. Moreover, at least one of theobject-side surface and the image-side surface of each of at least twolens elements of the photographing optical lens system can have at leastone inflection point. Moreover, at least one of the object-side surfaceand the image-side surface of each of at least three lens elements ofthe photographing optical lens system can have at least one inflectionpoint. Moreover, at least one of the object-side surface and theimage-side surface of each of at least four lens elements of thephotographing optical lens system can have at least one inflectionpoint. Moreover, both of the object-side surface and the image-sidesurface of each lens element of the photographing optical lens systemcan have at least one inflection point. Therefore, it is favorable foradjusting the surface shape of a single lens element so as to furtherimprove image quality. Please refer to FIG. 25, which shows a schematicview of inflection points P of the first lens element 110, the secondlens element 120, the third lens element 130, the fourth lens element140, the fifth lens element 150 and the sixth lens element 160 accordingto the 1st embodiment of the present disclosure.

When an Abbe number of the second lens element is V2, an Abbe number ofthe third lens element is V3, and an Abbe number of the fourth lenselement is V4, the following condition is satisfied: 30.0<V2+V3+V4<90.0.Therefore, it is favorable for the materials of the lens elements tocollaborate with one another for correcting chromatic aberration and forreducing color cast. Moreover, the following condition can also besatisfied: 40.0<V2+V3+V4<85.0.

When a central thickness of the first lens element is CT1, a centralthickness of the second lens element is CT2, a central thickness of thethird lens element is CT3, and an axial distance between the second lenselement and the third lens element is T23, the following condition issatisfied: 1.00<CT1/(CT2+T23+CT3). Therefore, it is favorable foradjusting the size distribution of the object side of the photographingoptical lens system so as to reduce the object-side outer diameter ofthe photographing optical lens system. Moreover, the following conditioncan also be satisfied: 1.10<CT1/(CT2+T23+CT3). Moreover, the followingcondition can also be satisfied: CT1/(CT2+T23+CT3)<2.40. Therefore, itis favorable for adjusting the size distribution of the object side ofthe photographing optical lens system so as to reduce the total tracklength. Moreover, the following condition can also be satisfied:CT1/(CT2+T23+CT3)<2.00. Moreover, the following condition can also besatisfied: 1.10<CT1/(CT2+T23+CT3)<2.40. Moreover, the followingcondition can also be satisfied: 1.10<CT1/(CT2+T23+CT3)<2.00.

When half of a maximum field of view of the photographing optical lenssystem is HFOV, the following condition is satisfied: 30.0 [deg.]<HFOV.Therefore, it is favorable for the photographing optical lens system tohave a wide angle configuration. Moreover, the following condition canalso be satisfied: 35.0 [deg.]<HFOV. Moreover, the following conditioncan also be satisfied: HFOV<80.0 [deg.]. Therefore, it is favorable forpreventing aberrations such as distortion caused by an overly largefield of view. Moreover, the following condition can also be satisfied:HFOV<60.0 [deg.]. Moreover, the following condition can also besatisfied: HFOV<45.0 [deg.]. Moreover, the following condition can alsobe satisfied: 35.0 [deg.]<HFOV<45.0 [deg.].

When a central thickness of the fifth lens element is CTS, a centralthickness of the sixth lens element is CT6, and an axial distancebetween the fifth lens element and the sixth lens element is T56, thefollowing condition can be satisfied: (CT5+CT6)/T56<10.0. Therefore, itis favorable for the fifth and sixth lens elements to collaborate witheach other to correct aberrations and reduce the total track length.Moreover, the following condition can also be satisfied:0.60<(CT5+CT6)/T56<6.0. Moreover, the following condition can also besatisfied: 0.75<(CT5+CT6)/T56<3.0.

When a central thickness of the fourth lens element is CT4, and thecentral thickness of the fifth lens element is CT5, the followingcondition can be satisfied: CT5/CT4<1.80. Therefore, it is favorable forthe fourth and fifth lens elements to collaborate with each other tocorrect aberrations. Moreover, the following condition can also besatisfied: CT5/CT4<1.55. Moreover, the following condition can also besatisfied: CT5/CT4<1.35. Moreover, the following condition can also besatisfied: CT5/CT4<1.25. Moreover, the following condition can also besatisfied: 0.30<CT5/CT4. Therefore, it is favorable for the fourth andfifth lens elements to collaborate with each other to reduce the size ofthe photographing optical lens system. Moreover, the following conditioncan also be satisfied: 0.60<CT5/CT4. Moreover, the following conditioncan also be satisfied: 0.75<CT5/CT4. Moreover, the following conditioncan also be satisfied: 0.60<CT5/CT4<1.55. Moreover, the followingcondition can also be satisfied: 0.75<CT5/CT4<1.25.

When an Abbe number of the first lens element is V1, the Abbe number ofthe second lens element is V2, the Abbe number of the third lens elementis V3, the Abbe number of the fourth lens element is V4, an Abbe numberof the fifth lens element is V5, an Abbe number of the sixth lenselement is V6, an Abbe number of the i-th lens element is Vi, arefractive index of the first lens element is N1, a refractive index ofthe second lens element is N2, a refractive index of the third lenselement is N3, a refractive index of the fourth lens element is N4, arefractive index of the fifth lens element is N5, a refractive index ofthe sixth lens element is N6, a refractive index of the i-th lenselement is Ni, and a minimum value of Vi/Ni is (Vi/Ni)min, the followingcondition can be satisfied: 6.0<(Vi/Ni)min<12.0, wherein i=1, 2, 3, 4, 5or 6. Therefore, it is favorable for adjusting the material distributionso as to correct aberrations such as chromatic aberration.

When a maximum effective radius of the object-side surface of the firstlens element is Y11, and the maximum effective radius of the image-sidesurface of the sixth lens element is Y62, the following condition can besatisfied: 2.2<Y62/Y11<5.0. Therefore, it is favorable for adjusting theobject-side outer diameter and image-side outer diameter of thephotographing optical lens system so as to obtain a balance among thesize, field of view, aperture size and image surface size of thephotographing optical lens system. Moreover, the following condition canalso be satisfied: 2.5<Y62/Y11<4.0. Please refer to FIG. 26, which showsa schematic view of Y11 and Y62 according to the 1st embodiment of thepresent disclosure.

When a focal length of the photographing optical lens system is f, afocal length of the first lens element is f1, a focal length of thesecond lens element is f2, a focal length of the third lens element isf3, a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, a focal length of the sixth lens elementis f6, and a focal length of the i-th lens element is fi, the followingcondition can be satisfied: Σ|f/fi|<5.0, wherein i=1, 2, 3, 4, 5 and 6.Therefore, it is favorable for adjusting the refractive power of thelens elements so as to obtain a balance between the field of view andsize of the photographing optical lens system. Moreover, the followingcondition can also be satisfied: 2.0<Σ|f/fi|<4.5, wherein i=1, 2, 3, 4,5 and 6.

When an f-number of the photographing optical lens system is Fno, thefollowing condition can be satisfied: 1.40<Fno<2.80. Therefore, it isfavorable for obtaining a balance between the depth of field andilluminance on the image surface. Moreover, the following condition canalso be satisfied: 1.70<Fno<2.50.

When the central thickness of the first lens element is CT1, and thecentral thickness of the second lens element is CT2, the followingcondition can be satisfied: 3.5<CT1/CT2<10. Therefore, it is favorablefor the first and second lens elements to collaborate with each other tocorrect aberrations and reduce the object-side outer diameter of thephotographing optical lens system.

When the central thickness of the first lens element is CT1, and adistance in parallel with the optical axis between a maximum effectiveradius position of the object-side surface of the first lens element anda maximum effective radius position of the image-side surface of thefirst lens element is ET1, the following condition can be satisfied:1.10<CT1/ET1<1.80. Therefore, it is favorable for adjusting the surfaceshape of the first lens element so as to reduce the outer diameter ofthe first lens element and the total track length of the photographingoptical lens system. Please refer to FIG. 26, which shows a schematicview of ET1 according to the 1st embodiment of the present disclosure.

When a curvature radius of the object-side surface of the fifth lenselement is R9, and a curvature radius of the image-side surface of thefifth lens element is R10, the following condition can be satisfied:0.50<R10/R9<2.2. Therefore, it is favorable for adjusting the surfaceshape of the fifth lens element so as to correct astigmatism andoff-axis field curvature.

When an axial distance between the object-side surface of the first lenselement and the image-side surface of the sixth lens element is TD, andthe central thickness of the first lens element is CT1, the followingcondition can be satisfied: 2.5<TD/CT1<5.0. Therefore, it is favorablefor adjusting the size distribution of the lens elements. Moreover, thefollowing condition can also be satisfied: 3.2<TD/CT1<4.6.

When an entrance pupil diameter of the photographing optical lens systemis EPD, and the central thickness of the first lens element is CT1, thefollowing condition can be satisfied: 1.4<EPD/CT1<2.5. Therefore, it isfavorable for obtaining a balance among the aperture size, the thicknessof the lens element and the outer diameter of the lens element.Moreover, the following condition can also be satisfied:1.6<EPD/CT1<2.2.

When the maximum effective radius of the object-side surface of thefirst lens element is Y11, and the distance in parallel with the opticalaxis between the maximum effective radius position of the object-sidesurface of the first lens element and the maximum effective radiusposition of the image-side surface of the first lens element is ET1, thefollowing condition can be satisfied: 0.60<Y11/ET1<3.0. Therefore, it isfavorable for adjusting the surface shape of the first lens element soas to adjust the size distribution at the object side of thephotographing optical lens system. Moreover, the following condition canalso be satisfied: 0.80<Y11/ET1<2.2. Moreover, the following conditioncan also be satisfied: 1.0<Y11/ET1<1.7.

When the focal length of the photographing optical lens system is f, anda curvature radius of the object-side surface of the first lens elementis R1, the following condition can be satisfied: 1.0<f/R1<2.0.Therefore, it is favorable for adjusting the refractive power of thefirst lens element so as to reduce the size of the photographing opticallens system.

When a minimum value among Abbe numbers of all lens elements of thephotographing optical lens system is Vmin, the following condition canbe satisfied: 10.0<Vmin<20.0. Therefore, it is favorable for adjustingAbbe number distribution of the photographing optical lens system so asto correct chromatic aberration.

When a maximum value among refractive indices of all lens elements ofthe photographing optical lens system is Nmax, the following conditioncan be satisfied: 1.66<Nmax<1.75. Therefore, it is favorable foradjusting refractive index distribution of the photographing opticallens system so as to correct aberrations and reduce the size of thephotographing optical lens system.

When the central thickness of the first lens element is CT1, the centralthickness of the second lens element is CT2, and the central thicknessof the third lens element is CT3, the following condition can besatisfied: 1.5<CT1/(CT2+CT3)<5.0. Therefore, it is favorable foradjusting the size distribution of the object side of the photographingoptical lens system so as to reduce the object-side outer diameter ofthe photographing optical lens system.

When the central thickness of the first lens element is CT1, and thecentral thickness of the fifth lens element is CTS, the followingcondition can be satisfied: 1.8<CT1/CT5<3.2. Therefore, it is favorablefor adjusting the size distribution of the object side and image side ofthe photographing optical lens system.

When the curvature radius of the object-side surface of the first lenselement is R1, and a curvature radius of the image-side surface of thefirst lens element is R2, the following condition can be satisfied:−0.75<(R1+R2)/(R1−R2)<0. Therefore, it is favorable for adjusting thesurface shape of the first lens element so as to reduce the total tracklength and the object-side outer diameter of the photographing opticallens system. Moreover, the following condition can also be satisfied:−0.60<(R1+R2)/(R1−R2)<−0.10.

When a sum of central thicknesses of all lens elements of thephotographing optical lens system is ΣCT, and a sum of axial distancesbetween each of all adjacent lens elements of the photographing opticallens system is ΣAT, the following condition can be satisfied:1.50<ΣCT/ΣAT<3.50. Therefore, it is favorable for adjusting thedistribution of the lens elements so as to reduce the total tracklength. Moreover, the following condition can also be satisfied:1.65<ΣCT/ΣAT<2.70.

When the distance in parallel with the optical axis between the maximumeffective radius position of the object-side surface of the first lenselement and the maximum effective radius position of the image-sidesurface of the first lens element is ET1, and a distance in parallelwith the optical axis between a maximum effective radius position of theobject-side surface of the second lens element and a maximum effectiveradius position of the image-side surface of the second lens element isET2, the following condition can be satisfied: 1.2<ET1/ET2<6.0.Therefore, it is favorable for adjusting the peripheral surface shape ofthe first and second lens elements so as to correct off-axis aberrationsand reduce the object-side outer diameter of the photographing opticallens system. Moreover, the following condition can also be satisfied:1.6<ET1/ET2<4.0. Please refer to FIG. 26, which shows a schematic viewof ET1 and ET2 according to the 1st embodiment of the presentdisclosure.

When the maximum effective radius of the object-side surface of thefirst lens element is Y11, and the central thickness of the first lenselement is CT1, the following condition can be satisfied:0.70<Y11/CT1<1.2. Therefore, it is favorable for adjusting the surfaceshape of the first lens element so as to reduce the size of the objectside of the photographing optical lens system. Moreover, the followingcondition can also be satisfied: 0.80<Y11/CT1<1.1.

According to the present disclosure, the photographing optical lenssystem further includes an aperture stop, and the aperture stop can bedisposed between the second lens element and an imaged object.Therefore, it is favorable for adjusting the position of the aperturestop so as to obtain a balance between the field of view and size of thephotographing optical lens system. Moreover, the aperture stop can alsobe disposed between the first lens element and the imaged object.

When an axial distance between the object-side surface of the first lenselement and the image surface is TL, and the focal length of thephotographing optical lens system is f, the following condition can besatisfied: 1.05<TL/f<1.50. Therefore, it is favorable for obtaining abalance between the size and field of view of the photographing opticallens system. Moreover, the following condition can also be satisfied:1.10<TL/f<1.30.

When the axial distance between the object-side surface of the firstlens element and the image surface is TL, and a maximum image height ofthe photographing optical lens system (half of a diagonal length of aneffective photosensitive area of the image sensor) is ImgH, thefollowing condition can be satisfied: 1.0<TL/ImgH<1.6. Therefore, it isfavorable for obtaining a balance between the reduction of the totaltrack length and the enlargement of the image surface.

When the focal length of the photographing optical lens system is f, thefocal length of the third lens element is f3, and the focal length ofthe fourth lens element is f4, the following condition can be satisfied:|f/f3|+|f/f4|<0.70. Therefore, it is favorable for balancing therefractive power distribution of the object side and image side of thephotographing optical lens system. Moreover, the following condition canalso be satisfied: |f/f3|+|f/f4|<0.60. Moreover, the following conditioncan also be satisfied: |f/f3|+|f/f4″<0.40.

According to the present disclosure, the aforementioned features andconditions can be utilized in numerous combinations so as to achievecorresponding effects.

According to the present disclosure, the lens elements of thephotographing optical lens system can be made of either glass or plasticmaterial. When the lens elements are made of glass material, therefractive power distribution of the photographing optical lens systemmay be more flexible, and the influence on imaging caused by externalenvironment temperature change may be reduced. The glass lens elementcan either be made by grinding or molding. When the lens elements aremade of plastic material, the manufacturing costs can be effectivelyreduced. Furthermore, surfaces of each lens element can be arranged tobe spherical or aspheric, wherein the former reduces manufacturingdifficulty, and the latter allows more control variables for eliminatingaberrations thereof, the required number of the lens elements can bereduced, and the total track length of the photographing optical lenssystem can be effectively shortened. Furthermore, the aspheric surfacesmay be formed by plastic injection molding or glass molding.

According to the present disclosure, when a lens surface is aspheric, itmeans that the lens surface has an aspheric shape throughout itsoptically effective area, or a portion(s) thereof.

According to the present disclosure, one or more of the lens elements'material may optionally include an additive which alters the lenselements' transmittance in a specific range of wavelength for areduction in unwanted stray light or colour deviation. For example, theadditive may optionally filter out light in the wavelength range of 600nm to 800 nm to reduce excessive red light and/or near infrared light;or may optionally filter out light in the wavelength range of 350 nm to450 nm to reduce excessive blue light and/or near ultraviolet light frominterfering the final image. The additive may be homogeneously mixedwith a plastic material to be used in manufacturing a mixed-materiallens element by injection molding.

According to the present disclosure, each of an object-side surface andan image-side surface has a paraxial region and an off-axis region. Theparaxial region refers to the region of the surface where light raystravel close to the optical axis, and the off-axis region refers to theregion of the surface away from the paraxial region. Particularly,unless otherwise stated, when the lens element has a convex surface, itindicates that the surface is convex in the paraxial region thereof;when the lens element has a concave surface, it indicates that thesurface is concave in the paraxial region thereof. Moreover, when aregion of refractive power or focus of a lens element is not defined, itindicates that the region of refractive power or focus of the lenselement is in the paraxial region thereof.

According to the present disclosure, an inflection point is a point onthe surface of the lens element at which the surface changes fromconcave to convex, or vice versa. A critical point is a non-axial pointof the lens surface where its tangent is perpendicular to the opticalaxis.

According to the present disclosure, the image surface of thephotographing optical lens system, based on the corresponding imagesensor, can be flat or curved, especially a curved surface being concavefacing towards the object side of the photographing optical lens system.

According to the present disclosure, an image correction unit, such as afield flattener, can be optionally disposed between the lens elementclosest to the image side of the photographing optical lens system andthe image surface for correction of aberrations such as field curvature.The optical properties of the image correction unit, such as curvature,thickness, index of refraction, position and surface shape (convex orconcave surface with spherical, aspheric, diffractive or Fresnel types),can be adjusted according to the design of the image capturing unit. Ingeneral, a preferable image correction unit is, for example, a thintransparent element having a concave object-side surface and a planarimage-side surface, and the thin transparent element is disposed nearthe image surface.

According to the present disclosure, the photographing optical lenssystem can include at least one stop, such as an aperture stop, a glarestop or a field stop. Said glare stop or said field stop is set foreliminating the stray light and thereby improving image quality thereof.

According to the present disclosure, an aperture stop can be configuredas a front stop or a middle stop. A front stop disposed between animaged object and the first lens element can provide a longer distancebetween an exit pupil of the photographing optical lens system and theimage surface to produce a telecentric effect, and thereby improves theimage-sensing efficiency of an image sensor (for example, CCD or CMOS).A middle stop disposed between the first lens element and the imagesurface is favorable for enlarging the viewing angle of thephotographing optical lens system and thereby provides a wider field ofview for the same.

According to the present disclosure, the photographing optical lenssystem can include an aperture control unit. The aperture control unitmay be a mechanical component or a light modulator, which can controlthe size and shape of the aperture through electricity or electricalsignals. The mechanical component can include a movable member, such asa blade assembly or a light baffle. The light modulator can include ashielding element, such as a filter, an electrochromic material or aliquid-crystal layer. The aperture control unit controls the amount ofincident light or exposure time to enhance the capability of imagequality adjustment. In addition, the aperture control unit can be theaperture stop of the present disclosure, which changes the f-number toobtain different image effects, such as the depth of field or lensspeed.

According to the above description of the present disclosure, thefollowing specific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 190. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 100, a first lens element 110, a stop 101, asecond lens element 120, a third lens element 130, a fourth lens element140, a fifth lens element 150, a sixth lens element 160, a filter 170and an image surface 180. The photographing optical lens system includessix lens elements (110, 120, 130, 140, 150 and 160) with no additionallens element disposed between each of the adjacent six lens elements.

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being convex in a paraxial region thereof. Thefirst lens element 110 is made of glass material and has the object-sidesurface 111 and the image-side surface 112 being both aspheric. Theobject-side surface 111 of the first lens element 110 has one inflectionpoint.

The second lens element 120 with negative refractive power has anobject-side surface 121 being concave in a paraxial region thereof andan image-side surface 122 being convex in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric. The object-side surface 121 of the second lens element 120 hasone inflection point. The image-side surface 122 of the second lenselement 120 has one inflection point. The object-side surface 121 of thesecond lens element 120 has one critical point in an off-axis regionthereof. The image-side surface 122 of the second lens element 120 hasone critical point in an off-axis region thereof.

The third lens element 130 with negative refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being concave in a paraxial region thereof. Thethird lens element 130 is made of plastic material and has theobject-side surface 131 and the image-side surface 132 being bothaspheric. The object-side surface 131 of the third lens element 130 hasone inflection point. The image-side surface 132 of the third lenselement 130 has two inflection points. The object-side surface 131 ofthe third lens element 130 has one critical point in an off-axis regionthereof.

The fourth lens element 140 with positive refractive power has anobject-side surface 141 being concave in a paraxial region thereof andan image-side surface 142 being convex in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric. The object-side surface 141 of the fourth lens element 140 hastwo inflection points.

The fifth lens element 150 with positive refractive power has anobject-side surface 151 being convex in a paraxial region thereof and animage-side surface 152 being concave in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric. The object-side surface 151 of the fifth lens element 150 hastwo inflection points. The image-side surface 152 of the fifth lenselement 150 has three inflection points. The object-side surface 151 ofthe fifth lens element 150 has one critical point in an off-axis regionthereof. The image-side surface 152 of the fifth lens element 150 hasone critical point in an off-axis region thereof.

The sixth lens element 160 with negative refractive power has anobject-side surface 161 being convex in a paraxial region thereof and animage-side surface 162 being concave in a paraxial region thereof. Thesixth lens element 160 is made of plastic material and has theobject-side surface 161 and the image-side surface 162 being bothaspheric. The object-side surface 161 of the sixth lens element 160 hastwo inflection points. The image-side surface 162 of the sixth lenselement 160 has two inflection points. The object-side surface 161 ofthe sixth lens element 160 has one critical point in an off-axis regionthereof. The image-side surface 162 of the sixth lens element 160 hasone critical point in an off-axis region thereof.

The filter 170 is made of glass material and located between the sixthlens element 160 and the image surface 180, and will not affect thefocal length of the photographing optical lens system. The image sensor190 is disposed on or near the image surface 180 of the photographingoptical lens system.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}{({Ai}) \times \left( Y^{i} \right)}}}},$

where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14, 16, 18 and 20.

In the photographing optical lens system of the image capturing unitaccording to the 1st embodiment, when a focal length of thephotographing optical lens system is f, an f-number of the photographingoptical lens system is Fno, and half of a maximum field of view of thephotographing optical lens system is HFOV, these parameters have thefollowing values: f=3.89 millimeters (mm), Fno=2.24, HFOV=39.2 degrees(deg.).

When a maximum value among refractive indices of all lens elements ofthe photographing optical lens system is Nmax, the following conditionis satisfied: Nmax=1.686. In this embodiment, among the six lenselements (110, 120, 130, 140, 150 and 160) of the photographing opticallens system, a refractive index of the third lens element 130 and arefractive index of the fourth lens element 140 are the same and areboth larger than refractive indices of the other lens elements, so Nmaxis equal to the refractive index of the third lens element 130 and therefractive index of the fourth lens element 140.

When an Abbe number of the first lens element 110 is V1, an Abbe numberof the second lens element 120 is V2, an Abbe number of the third lenselement 130 is V3, an Abbe number of the fourth lens element 140 is V4,an Abbe number of the fifth lens element 150 is V5, an Abbe number ofthe sixth lens element is V6, an Abbe number of the i-th is Vi, arefractive index of the first lens element 110 is N1, a refractive indexof the second lens element 120 is N2, the refractive index of the thirdlens element 130 is N3, the refractive index of the fourth lens element140 is N4, a refractive index of the fifth lens element 150 is N5, arefractive index of the sixth lens element 160 is N6, a refractive indexof the i-th lens element is Ni, and a minimum value of Vi/Ni is(Vi/Ni)min, the following condition is satisfied: (V/N)min=10.90. Inthis embodiment, (Vi/Ni)min is equal to V3/N3 and V4/N4.

When the Abbe number of the second lens element 120 is V2, the Abbenumber of the third lens element 130 is V3, and the Abbe number of thefourth lens element 140 is V4, the following condition is satisfied:V2+V3+V4=62.7.

When a minimum value among Abbe numbers of all lens elements of thephotographing optical lens system is Vmin, the following condition issatisfied: Vmin=18.4. In this embodiment, among the six lens elements(110, 120, 130, 140, 150 and 160) of the photographing optical lenssystem, the Abbe number of the third lens element 130 and the Abbenumber of the fourth lens element 140 are the same and are both smallerthan Abbe numbers of the other lens elements, so Vmin is equal to theAbbe number of the third lens element 130 and the Abbe number of thefourth lens element 140.

When a sum of central thicknesses of all lens elements of thephotographing optical lens system is ΣCT, and a sum of axial distancesbetween each of all adjacent lens elements of the photographing opticallens system is ΣAT, the following condition is satisfied: ΣCT/ΣAT=2.23.In this embodiment, an axial distance between two adjacent lens elementsis an axial distance between two adjacent lens surfaces of the twoadjacent lens elements; ΣCT is a sum of central thicknesses of the firstlens element 110, the second lens element 120, the third lens element130, the fourth lens element 140, the fifth lens element 150 and thesixth lens element 160; and ΣAT is a sum of axial distances between thefirst lens element 110 and the second lens element 120, the second lenselement 120 and the third lens element 130, the third lens element 130and the fourth lens element 140, the fourth lens element 140 and thefifth lens element 150, and the fifth lens element 150 and the sixthlens element 160.

When the central thickness of the first lens element 110 is CT1, and thecentral thickness of the second lens element 120 is CT2, the followingcondition is satisfied: CT1/CT2=4.78.

When the central thickness of the first lens element 110 is CT1, and thecentral thickness of the fifth lens element 150 is CT5, the followingcondition is satisfied: CT1/CT5=2.40.

When the central thickness of the first lens element 110 is CT1, thecentral thickness of the second lens element 120 is CT2, and the centralthickness of the third lens element 130 is CT3, the following conditionis satisfied: CT1/(CT2+CT3)=2.44.

When the central thickness of the first lens element 110 is CT1, thecentral thickness of the second lens element 120 is CT2, the centralthickness of the third lens element 130 is CT3, and the axial distancebetween the second lens element 120 and the third lens element 130 isT23, the following condition is satisfied: CT1/(CT2+T23+CT3)=1.57.

When the central thickness of the first lens element 110 is CT1, and adistance in parallel with the optical axis between a maximum effectiveradius position of the object-side surface 111 of the first lens element110 and a maximum effective radius position of the image-side surface112 of the first lens element 110 is ET1, the following condition issatisfied: CT1/ET1=1.49.

When the central thickness of the fifth lens element 150 is CT5, thecentral thickness of the sixth lens element 160 is CT6, and the axialdistance between the fifth lens element 150 and the sixth lens element160 is T56, the following condition is satisfied: (CT5+CT6)/T56=1.90.

When the central thickness of the fourth lens element 140 is CT4, andthe central thickness of the fifth lens element 150 is CT5, thefollowing condition is satisfied: CT5/CT4=0.94.

When an axial distance between the object-side surface 111 of the firstlens element 110 and the image-side surface 162 of the sixth lenselement 160 is TD, and the central thickness of the first lens element110 is CT1, the following condition is satisfied: TD/CT1=3.82.

When an axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 180 is TL, and the focal lengthof the photographing optical lens system is f, the following conditionis satisfied: TL/f=1.20.

When the axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 180 is TL, and a maximum imageheight of the photographing optical lens system is ImgH, the followingcondition is satisfied: TL/ImgH=1.43.

When a curvature radius of the object-side surface 111 of the first lenselement 110 is R1, and a curvature radius of the image-side surface 112of the first lens element 110 is R2, the following condition issatisfied: (R1+R2)/(R1−R2)=−0.46.

When a curvature radius of the object-side surface 151 of the fifth lenselement 150 is R9, and a curvature radius of the image-side surface 152of the fifth lens element 150 is R10, the following condition issatisfied: R10/R9=1.62.

When the focal length of the photographing optical lens system is f, afocal length of the first lens element 110 is f1, a focal length of thesecond lens element 120 is f2, a focal length of the third lens element130 is f3, a focal length of the fourth lens element 140 is f4, a focallength of the fifth lens element 150 is f5, a focal length of the sixthlens element 160 is f6, and a focal length of the i-th lens element isfi, the following condition is satisfied: Σ|f/fi|=3.59, wherein i=1, 2,3, 4, 5 and 6.

When the focal length of the photographing optical lens system is f, thefocal length of the third lens element 130 is f3, and the focal lengthof the fourth lens element 140 is f4, the following condition issatisfied: |f/f3|+|f/f4|=0.56.

When the focal length of the photographing optical lens system is f, andthe curvature radius of the object-side surface 111 of the first lenselement 110 is R1, the following condition is satisfied: f/R1=1.91.

When an entrance pupil diameter of the photographing optical lens systemis EPD, and the central thickness of the first lens element 110 is CT1,the following condition is satisfied: EPD/CT1=1.87.

When the distance in parallel with the optical axis between the maximumeffective radius position of the object-side surface 111 of the firstlens element 110 and the maximum effective radius position of theimage-side surface 112 of the first lens element 110 is ET1, and adistance in parallel with the optical axis between a maximum effectiveradius position of the object-side surface 121 of the second lenselement 120 and a maximum effective radius position of the image-sidesurface 122 of the second lens element 120 is ET2, the followingcondition is satisfied: ET1/ET2=2.28.

When a maximum effective radius of the object-side surface 111 of thefirst lens element 110 is Y11, and the central thickness of the firstlens element 110 is CT1, the following condition is satisfied:Y11/CT1=0.95.

When the maximum effective radius of the object-side surface 111 of thefirst lens element 110 is Y11, and the distance in parallel with theoptical axis between the maximum effective radius position of theobject-side surface 111 of the first lens element 110 and the maximumeffective radius position of the image-side surface 112 of the firstlens element 110 is ET1, the following condition is satisfied:Y11/ET1=1.41.

When the maximum effective radius of the object-side surface 111 of thefirst lens element 110 is Y11, and a maximum effective radius of theimage-side surface 162 of the sixth lens element 160 is Y62, thefollowing condition is satisfied: Y62/Y11=2.71.

When a vertical distance between the critical point on the object-sidesurface 151 of the fifth lens element 150 and the optical axis is Yc51,and a vertical distance between the critical point on the image-sidesurface 152 of the fifth lens element 150 and the optical axis is Yc52,the following condition is satisfied: Yc51/Yc52=1.04.

When a vertical distance between the critical point on the image-sidesurface 162 of the sixth lens element 160 and the optical axis is Yc62,and the maximum effective radius of the image-side surface 162 of thesixth lens element 160 is Y62, the following condition is satisfied:Yc62/Y62=0.42.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 3.89 mm, Fno = 2.24, HFOV = 39.2 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano 400.000 1 Ape. Stop Plano −0.100 2 Lens 1 2.035 (ASP) 0.941 Glass1.542 62.9 2.86 3 −5.460 (ASP) 0.064 4 Stop Plano −0.016 5 Lens 2 −7.238(ASP) 0.197 Plastic 1.614 26.0 −12.23 6 −202.840 (ASP) 0.213 7 Lens 33.038 (ASP) 0.188 Plastic 1.686 18.4 −10.11 8 2.060 (ASP) 0.363 9 Lens 4−3.631 (ASP) 0.416 Plastic 1.686 18.4 21.85 10 −3.059 (ASP) 0.097 11Lens 5 2.066 (ASP) 0.392 Plastic 1.534 55.9 9.15 12 3.344 (ASP) 0.391 13Lens 6 3.216 (ASP) 0.350 Plastic 1.534 55.9 −4.24 14 1.277 (ASP) 0.40015 Filter Plano 0.145 Glass 1.517 64.2 — 16 Plano 0.518 17 Image Plano —Note: Reference wavelength is 587.6 nm (d-line). An effective radius ofthe stop 101 (Surface 4) is 0.885 mm.

TABLE 2 Aspheric Coefficients Surface # 2 3 5 6 7 8 k = −7.5410E+00−4.8108E+01 4.7991E+01 9.0000E+01 −1.6785E+00 −1.6055E+00 A4 = 4.3445E−02 −1.3443E−01 1.8755E−01 1.5773E−01 −3.8084E−01 −2.7819E−01 A6=  1.0210E−01 −2.4175E−01 −6.0783E−02  3.3870E−01  1.0763E−01−3.0521E−02 A8 = −7.8447E−01  1.0121E+00 5.7304E−02 −9.3596E−01  8.7786E−01  6.9261E−01 A10 =  1.8427E+00 −2.1213E+00 −2.0467E−01 1.2370E+00 −1.7544E+00 −1.0392E+00 A12 = −2.4179E+00  2.6494E+003.6712E−01 −1.0580E+00   1.4464E+00  7.0308E−01 A14 =  1.6256E+00−1.7956E+00 −1.3743E−01  4.8305E−01 −4.9057E−01 −1.8642E−01 A16 =−4.3458E−01  5.0823E−01 — — —  1.9989E−03 Surface # 9 10 11 12 13 14 k =1.3177E+00 2.5273E−01 −4.5806E−01 −8.4354E+01  4.4503E−01 −1.1061E+00 A4= 3.8740E−01 3.2956E−01 −1.2089E−02  9.1257E−02 −4.3052E−01 −4.3073E−01A6 = −7.3061E−01  −7.2203E−01  −2.5690E−01 −1.8039E−01  2.2019E−01 3.0697E−01 A8 = 9.1121E−01 1.0283E+00  3.5709E−01  1.4493E−01−7.9400E−02 −1.7707E−01 A10 = −7.7023E−01  −9.5815E−01  −3.4327E−01−9.4375E−02  4.0355E−02  7.8161E−02 A12 = 3.6939E−01 5.6696E−01 2.2401E−01  4.6866E−02 −1.9833E−02 −2.4343E−02 A14 = −9.2374E−02 −2.1130E−01  −9.7561E−02 −1.5189E−02  6.0486E−03  5.0168E−03 A16 =9.0101E−03 4.5838E−02  2.6800E−02  2.9219E−03 −1.0477E−03 −6.4483E−04A18 = — −4.4031E−03  −4.0929E−03 −2.9864E−04  9.5709E−05  4.6658E−05 A20= — —  2.5935E−04  1.2284E−05 −3.6000E−06 −1.4471E−06

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-17 represent the surfacessequentially arranged from the object side to the image side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-20 represent the asphericcoefficients ranging from the 4th order to the 20th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the tables arethe same as Table 1 and Table 2 of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 290. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 200, a first lens element 210, a stop 201, asecond lens element 220, a third lens element 230, a fourth lens element240, a fifth lens element 250, a sixth lens element 260, a filter 270and an image surface 280. The photographing optical lens system includessix lens elements (210, 220, 230, 240, 250 and 260) with no additionallens element disposed between each of the adjacent six lens elements.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being convex in a paraxial region thereof. Thefirst lens element 210 is made of plastic material and has theobject-side surface 211 and the image-side surface 212 being bothaspheric. The object-side surface 211 of the first lens element 210 hasone inflection point.

The second lens element 220 with negative refractive power has anobject-side surface 221 being planar in a paraxial region thereof and animage-side surface 222 being concave in a paraxial region thereof. Thesecond lens element 220 is made of plastic material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with positive refractive power has anobject-side surface 231 being convex in a paraxial region thereof and animage-side surface 232 being concave in a paraxial region thereof. Thethird lens element 230 is made of plastic material and has theobject-side surface 231 and the image-side surface 232 being bothaspheric. The object-side surface 231 of the third lens element 230 hastwo inflection points. The image-side surface 232 of the third lenselement 230 has two inflection points. The object-side surface 231 ofthe third lens element 230 has two critical points in an off-axis regionthereof. The image-side surface 232 of the third lens element 230 hastwo critical points in an off-axis region thereof.

The fourth lens element 240 with positive refractive power has anobject-side surface 241 being concave in a paraxial region thereof andan image-side surface 242 being convex in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric. The object-side surface 241 of the fourth lens element 240 hasthree inflection points. The image-side surface 242 of the fourth lenselement 240 has two inflection points.

The fifth lens element 250 with positive refractive power has anobject-side surface 251 being convex in a paraxial region thereof and animage-side surface 252 being concave in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric. The object-side surface 251 of the fifth lens element 250 hasthree inflection points. The image-side surface 252 of the fifth lenselement 250 has two inflection points. The object-side surface 251 ofthe fifth lens element 250 has one critical point in an off-axis regionthereof. The image-side surface 252 of the fifth lens element 250 hasone critical point in an off-axis region thereof.

The sixth lens element 260 with negative refractive power has anobject-side surface 261 being convex in a paraxial region thereof and animage-side surface 262 being concave in a paraxial region thereof. Thesixth lens element 260 is made of plastic material and has theobject-side surface 261 and the image-side surface 262 being bothaspheric. The object-side surface 261 of the sixth lens element 260 hastwo inflection points. The image-side surface 262 of the sixth lenselement 260 has one inflection point. The object-side surface 261 of thesixth lens element 260 has one critical point in an off-axis regionthereof. The image-side surface 262 of the sixth lens element 260 hasone critical point in an off-axis region thereof.

The filter 270 is made of glass material and located between the sixthlens element 260 and the image surface 280, and will not affect thefocal length of the photographing optical lens system. The image sensor290 is disposed on or near the image surface 280 of the photographingoptical lens system.

In this embodiment, an Abbe number of the i-th lens element is Vi, arefractive index of the i-th lens element is Ni, a minimum value ofVi/Ni is (Vi/Ni)min, and (Vi/Ni)min is equal to V2/N2. In addition, anAbbe number of the second lens element 220 is V2, and a refractive indexof the second lens element 220 is N2.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 3.89 mm, Fno = 2.27, HFOV = 39.3 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano 400.000 1 Ape. Stop Plano −0.100 2 Lens 1 2.341 (ASP) 0.845Plastic 1.545 56.1 3.24 3 −6.298 (ASP) 0.123 4 Stop Plano 0.069 5 Lens 2∞ (ASP) 0.148 Plastic 1.701 14.7 −8.34 6 5.847 (ASP) 0.217 7 Lens 35.480 (ASP) 0.297 Plastic 1.614 26.0 196.25 8 5.623 (ASP) 0.364 9 Lens 4−2.934 (ASP) 0.445 Plastic 1.614 26.0 53.16 10 −2.848 (ASP) 0.033 11Lens 5 1.708 (ASP) 0.369 Plastic 1.544 56.0 7.04 12 2.848 (ASP) 0.378 13Lens 6 2.607 (ASP) 0.340 Plastic 1.534 55.9 −4.11 14 1.138 (ASP) 0.34115 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano 0.695 17 Image Plano —Note: Reference wavelength is 587.6 nm (d-line). An effective radius ofthe stop 201 (Surface 4) is 0.840 mm.

TABLE 4 Aspheric Coefficients Surface # 2 3 5 6 7 8 k = −9.1788E+00 −5.9086E+01 0.0000E+00 −9.8554E+01  1.6386E+01  1.3736E+01 A4 =3.0735E−02 −5.8728E−02 1.5896E−01  2.0247E−01 −1.2141E−01 −1.3722E−02 A6= 3.9704E−02 −3.3810E−01 −4.6696E−01  −4.5413E−01 −5.8919E−01−6.2314E−01 A8 = −3.3759E−01   1.4498E+00 1.7025E+00  1.5477E+00 2.0490E+00  1.1887E+00 A10 = 5.5437E−01 −3.5201E+00 −3.7265E+00 −3.0296E+00 −3.3245E+00 −1.0773E+00 A12 = −3.9220E−01   4.8674E+004.4982E+00  2.9543E+00  2.7872E+00  2.6891E−01 A14 = 1.5971E−02−3.5360E+00 −2.6713E+00  −1.0958E+00 −9.0602E−01  2.7164E−01 A16 =7.4381E−02  1.0498E+00 5.9492E−01 — — −1.3834E−01 Surface # 9 10 11 1213 14 k =  2.7996E−01 −3.0584E+00 −6.8233E−01 −3.9901E+01 4.6412E−02−1.1697E+00 A4 =  4.8901E−01  3.0922E−01 −7.4141E−02  9.1858E−02−3.9082E−01  −4.5678E−01 A6 = −8.4713E−01 −5.4847E−01 −1.7843E−01−1.9369E−01 1.1480E−01  3.3279E−01 A8 =  7.2330E−01  4.3891E−01 2.3598E−01  1.5401E−01 4.1444E−02 −1.8894E−01 A10 = −2.2992E−01−1.1111E−01 −2.2956E−01 −8.6003E−02 −4.0949E−02   7.8871E−02 A12 =−1.8719E−01 −9.4595E−02  1.6841E−01  3.5496E−02 1.3406E−02 −2.2823E−02A14 =  1.7413E−01  8.1454E−02 −8.5061E−02 −1.0025E−02 −2.3190E−03  4.3556E−03 A16 = −3.7889E−02 −2.2403E−02  2.6681E−02  1.7382E−032.1751E−04 −5.1804E−04 A18 = —  2.0535E−03 −4.5476E−03 −1.5973E−04−9.2969E−06   3.4624E−05 A20 = — —  3.1714E−04  5.6409E−06 5.9337E−08−9.8989E−07

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 3.89 TD/CT1 4.29 Fno 2.27 TL/f 1.23 HFOV [deg.]39.3 TL/ImgH 1.46 Nmax 1.701 (R1 + R2)/(R1 − R2) −0.46 (Vi/Ni)min 8.64R10/R9 1.67 V2 + V3 + V4 66.6 Σ|f/fi| 3.26 Vmin 14.7 |f/f3| + |f/f4|0.09 ΣCT/ΣAT 2.06 f/R1 1.66 CT1/CT2 5.71 EPD/CT1 2.06 CT1/CT5 2.29ET1/ET2 2.65 CT1/(CT2 + CT3) 1.90 Y11/CT1 1.03 CT1/(CT2 + T23 + CT3)1.28 Y11/ET1 1.42 CT1/ET1 1.38 Y62/Y11 2.75 (CT5 + CT6)/T56 1.88Yc51/Yc52 0.97 CT5/CT4 0.83 Yc62/Y62 0.45

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 390. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 300, a first lens element 310, a stop 301, asecond lens element 320, a third lens element 330, a fourth lens element340, a fifth lens element 350, a sixth lens element 360, a filter 370and an image surface 380. The photographing optical lens system includessix lens elements (310, 320, 330, 340, 350 and 360) with no additionallens element disposed between each of the adjacent six lens elements.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being convex in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric. The object-side surface 311 of the first lens element 310 hasone inflection point.

The second lens element 320 with negative refractive power has anobject-side surface 321 being concave in a paraxial region thereof andan image-side surface 322 being concave in a paraxial region thereof.The second lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric. The object-side surface 321 of the second lens element 320 hasone inflection point. The object-side surface 321 of the second lenselement 320 has one critical point in an off-axis region thereof.

The third lens element 330 with negative refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being concave in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric. The object-side surface 331 of the third lens element 330 hasone inflection point. The image-side surface 332 of the third lenselement 330 has two inflection points. The object-side surface 331 ofthe third lens element 330 has one critical point in an off-axis regionthereof.

The fourth lens element 340 with positive refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being convex in a paraxial region thereof. Thefourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric. The object-side surface 341 of the fourth lens element 340 hastwo inflection points. The image-side surface 342 of the fourth lenselement 340 has two inflection points.

The fifth lens element 350 with positive refractive power has anobject-side surface 351 being convex in a paraxial region thereof and animage-side surface 352 being concave in a paraxial region thereof. Thefifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric. The object-side surface 351 of the fifth lens element 350 hasthree inflection points. The image-side surface 352 of the fifth lenselement 350 has three inflection points. The object-side surface 351 ofthe fifth lens element 350 has one critical point in an off-axis regionthereof. The image-side surface 352 of the fifth lens element 350 hasone critical point in an off-axis region thereof.

The sixth lens element 360 with negative refractive power has anobject-side surface 361 being convex in a paraxial region thereof and animage-side surface 362 being concave in a paraxial region thereof. Thesixth lens element 360 is made of plastic material and has theobject-side surface 361 and the image-side surface 362 being bothaspheric. The object-side surface 361 of the sixth lens element 360 hastwo inflection points. The image-side surface 362 of the sixth lenselement 360 has two inflection points. The object-side surface 361 ofthe sixth lens element 360 has one critical point in an off-axis regionthereof. The image-side surface 362 of the sixth lens element 360 hasone critical point in an off-axis region thereof.

The filter 370 is made of glass material and located between the sixthlens element 360 and the image surface 380, and will not affect thefocal length of the photographing optical lens system. The image sensor390 is disposed on or near the image surface 380 of the photographingoptical lens system.

In this embodiment, an Abbe number of the i-th lens element is Vi, arefractive index of the i-th lens element is Ni, a minimum value ofVi/Ni is (Vi/Ni)min, and (Vi/Ni)min is equal to V2/N2 and V4/N4. Inaddition, an Abbe number of the second lens element 320 is V2, an Abbenumber of the fourth lens element 340 is V4, a refractive index of thesecond lens element 320 is N2, and a refractive index of the fourth lenselement 340 is N4.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 3.90 mm, Fno = 2.25, HFOV = 39.2 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano 400.000 1 Ape. Stop Plano −0.100 2 Lens 1 2.040 (ASP) 0.941Plastic 1.545 56.1 2.80 3 −5.098 (ASP) 0.070 4 Stop Plano −0.004 5 Lens2 −7.348 (ASP) 0.210 Plastic 1.669 19.5 −6.83 6 12.240 (ASP) 0.189 7Lens 3 2.326 (ASP) 0.230 Plastic 1.587 28.3 −25.08 8 1.936 (ASP) 0.375 9Lens 4 −3.979 (ASP) 0.373 Plastic 1.669 19.5 65.85 10 −3.787 (ASP) 0.10311 Lens 5 1.947 (ASP) 0.393 Plastic 1.544 56.0 7.47 12 3.472 (ASP) 0.39713 Lens 6 3.217 (ASP) 0.354 Plastic 1.534 55.9 −4.32 14 1.292 (ASP)0.400 15 Filter Plano 0.210 Glass 1.517 64.2 — 16 Plano 0.451 17 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line). An effectiveradius of the stop 301 (Surface 4) is 0.881 mm.

TABLE 6 Aspheric Coefficients Surface # 2 3 5 6 7 8 k = −7.3427E+00−7.1650E+01 5.2015E+01 6.2044E+01 −1.3706E+00 −1.9916E+00 A4 = 3.5737E−02 −1.0507E−01 2.7057E−01 1.4597E−01 −4.0036E−01 −2.4145E−01 A6=  1.8118E−01 −6.6448E−02 −2.5489E−01  3.0117E−01  3.3854E−01−3.6847E−02 A8 = −1.1489E+00 −4.9828E−01 −3.1361E−01  −1.0931E+00  1.3780E−01  5.7195E−01 A10 =  2.8289E+00  1.9885E+00 1.3364E+001.6197E+00 −6.7251E−01 −9.1617E−01 A12 = −3.9187E+00 −2.8472E+00−1.3511E+00  −1.2086E+00   6.5035E−01  7.2421E−01 A14 =  2.8351E+00 1.8863E+00 4.9888E−01 4.0601E−01 −2.3232E−01 −2.7479E−01 A16 =−8.3803E−01 −4.8530E−01 — — —  3.7462E−02 Surface # 9 10 11 12 13 14 k =−2.6126E+00 −1.8237E−01 −5.3301E−01 −8.1073E+01  4.3897E−01 −1.0991E+00A4 =  4.0717E−01  3.5541E−01 −1.3070E−02  9.6390E−02 −4.3090E−01−4.3999E−01 A6 = −7.9065E−01 −7.8706E−01 −2.4857E−01 −1.9038E−01 2.2067E−01  3.2948E−01 A8 =  9.9424E−01  1.0954E+00  3.4412E−01 1.5900E−01 −7.9545E−02 −1.9916E−01 A10 = −8.3784E−01 −9.8416E−01−3.3310E−01 −1.0664E−01  4.0035E−02  9.0571 E−02 A12 =  4.0201E−01 5.5526E−01  2.2207E−01  5.3211 E−02 −1.9504E−02 −2.8645E−02 A14 =−1.0209E−01 −1.9611E−01 −9.9451E−02 −1.7137E−02  5.9100E−03  5.9482E−03A16 =  1.1053E−02  4.0562E−02  2.8073E−02  3.2650E−03 −1.0171E−03−7.6767E−04 A18 = — −3.7767E−03 −4.4049E−03 −3.2976E−04  9.2243E−05 5.5697E−05 A20 = — —  2.8817E−04  1.3351E−05 −3.4399E−06 −1.7322E−06

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 3.90 TD/CT1 3.86 Fno 2.25 TL/f 1.20 HFOV [deg.]39.2 TL/ImgH 1.44 Nmax 1.669 (R1 + R2)/(R1 − R2) −0.43 (Vi/Ni)min 11.65R10/R9 1.78 V2 + V3 + V4 67.2 Σ|f/fi| 3.60 Vmin 19.5 |f/f3| + |f/f4|0.21 ΣCT/ΣAT 2.21 f/R1 1.91 CT1/CT2 4.48 EPD/CT1 1.87 CT1/CT5 2.39ET1/ET2 1.97 CT1/(CT2 + CT3) 2.14 Y11/CT1 0.94 CT1/(CT2 + T23 + CT3)1.50 Y11/ET1 1.40 CT1/ET1 1.48 Y62/Y11 2.73 (CT5 + CT6)/T56 1.88Yc51/Yc52 1.07 CT5/CT4 1.05 Yc62/Y62 0.42

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 490. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 400, a first lens element 410, a stop 401, asecond lens element 420, a third lens element 430, a fourth lens element440, a fifth lens element 450, a sixth lens element 460, a filter 470and an image surface 480. The photographing optical lens system includessix lens elements (410, 420, 430, 440, 450 and 460) with no additionallens element disposed between each of the adjacent six lens elements.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being convex in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric. The object-side surface 411 of the first lens element 410 hasone inflection point.

The second lens element 420 with negative refractive power has anobject-side surface 421 being concave in a paraxial region thereof andan image-side surface 422 being concave in a paraxial region thereof.The second lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric. The object-side surface 421 of the second lens element 420 hasone inflection point. The object-side surface 421 of the second lenselement 420 has one critical point in an off-axis region thereof.

The third lens element 430 with negative refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being concave in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric. The object-side surface 431 of the third lens element 430 hastwo inflection points. The image-side surface 432 of the third lenselement 430 has two inflection points. The object-side surface 431 ofthe third lens element 430 has two critical points in an off-axis regionthereof. The image-side surface 432 of the third lens element 430 hastwo critical points in an off-axis region thereof.

The fourth lens element 440 with positive refractive power has anobject-side surface 441 being concave in a paraxial region thereof andan image-side surface 442 being convex in a paraxial region thereof. Thefourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric. The object-side surface 441 of the fourth lens element 440 hastwo inflection points. The image-side surface 442 of the fourth lenselement 440 has two inflection points.

The fifth lens element 450 with positive refractive power has anobject-side surface 451 being convex in a paraxial region thereof and animage-side surface 452 being concave in a paraxial region thereof. Thefifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric. The object-side surface 451 of the fifth lens element 450 hasthree inflection points. The image-side surface 452 of the fifth lenselement 450 has three inflection points. The object-side surface 451 ofthe fifth lens element 450 has one critical point in an off-axis regionthereof. The image-side surface 452 of the fifth lens element 450 hasone critical point in an off-axis region thereof.

The sixth lens element 460 with negative refractive power has anobject-side surface 461 being convex in a paraxial region thereof and animage-side surface 462 being concave in a paraxial region thereof. Thesixth lens element 460 is made of plastic material and has theobject-side surface 461 and the image-side surface 462 being bothaspheric. The object-side surface 461 of the sixth lens element 460 hastwo inflection points. The image-side surface 462 of the sixth lenselement 460 has two inflection points. The object-side surface 461 ofthe sixth lens element 460 has one critical point in an off-axis regionthereof. The image-side surface 462 of the sixth lens element 460 hasone critical point in an off-axis region thereof.

The filter 470 is made of glass material and located between the sixthlens element 460 and the image surface 480, and will not affect thefocal length of the photographing optical lens system. The image sensor490 is disposed on or near the image surface 480 of the photographingoptical lens system.

In this embodiment, an Abbe number of the i-th lens element is Vi, arefractive index of the i-th lens element is Ni, a minimum value ofVi/Ni is (Vi/Ni)min, and (Vi/Ni)min is equal to V2/N2. In addition, anAbbe number of the second lens element 420 is V2, and a refractive indexof the second lens element 420 is N2.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 3.92 mm, Fno = 2.29, HFOV = 39.0 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano 400.000 1 Ape. Stop Plano −0.100 2 Lens 1 2.311 (ASP) 0.880Plastic 1.545 56.1 2.84 3 −4.038 (ASP) 0.075 4 Stop Plano 0.080 5 Lens 2−9.763 (ASP) 0.210 Plastic 1.669 19.5 −5.91 6 6.703 (ASP) 0.241 7 Lens 37.529 (ASP) 0.299 Plastic 1.566 37.4 −86.69 8 6.434 (ASP) 0.344 9 Lens 4−3.242 (ASP) 0.426 Plastic 1.639 23.5 356.74 10 −3.360 (ASP) 0.030 11Lens 5 1.644 (ASP) 0.408 Plastic 1.544 56.0 6.69 12 2.735 (ASP) 0.383 13Lens 6 2.553 (ASP) 0.354 Plastic 1.534 55.9 −4.41 14 1.166 (ASP) 0.39115 Filter Plano 0.210 Glass 1.517 64.2 — 16 Plano 0.539 17 Image Plano —Note: Reference wavelength is 587.6 nm (d-line). An effective radius ofthe stop 401 (Surface 4) is 0.840 mm.

TABLE 8 Aspheric Coefficients Surface # 2 3 5 6 7 8 k = −9.1119E+00−4.0406E+01  0.0000E+00 −9.9000E+01  2.1798E+01  5.5200E+00 A4 = 4.1487E−02 −1.0118E−01  1.4874E−01  1.8139E−01 −1.4958E−01 −1.7180E−02A6 = −2.0522E−02 −1.1362E−01 −1.2064E−01 −2.0991E−01 −4.4894E−01−6.2604E−01 A8 = −1.0654E−01  5.2939E−01 −9.7104E−02  5.4061E−01 1.7043E+00  1.1978E+00 A10 = −7.9307E−02 −1.3835E+00  5.8813E−01−1.0721E+00 −2.8042E+00 −1.1189E+00 A12 =  6.5815E−01  2.0911E+00−9.5925E−01  1.1248E+00  2.3575E+00  3.6744E−01 A14 = −9.3527E−01−1.6685E+00  8.2919E−01 −4.3838E−01 −7.5633E−01  1.6805E−01 A16 = 4.2794E−01  5.4576E−01 −3.0143E−01 — — −1.0103E−01 Surface # 9 10 11 1213 14 k = −9.9694E−01 −3.4314E+00 −7.1596E−01 −4.0342E+01  0.0000E+00−1.1343E+00 A4 =  5.0576E−01  3.4529E−01 −7.5599E−02  9.5036E−02−4.0175E−01 −4.5704E−01 A6 = −8.5524E−01 −5.8820E−01 −1.6933E−01−2.0612E−01  1.2290E−01  3.2696E−01 A8 =  6.7014E−01  4.8305E−01 2.3970E−01  1.7209E−01  3.9322E−02 −1.7614E−01 A10 = −1.2449E−01−1.8245E−01 −2.5163E−01 −1.0135E−01 −4.1111E−02  6.9443E−02 A12 =−2.6745E−01 −2.1749E−02  1.9058E−01  4.3832E−02  1.3570E−02 −1.9153E−02A14 =  2.0686E−01  4.2202E−02 −9.6326E−02 −1.2882E−02 −2.3349E−03 3.5134E−03 A16 = −4.4636E−02 −1.2093E−02  2.9914E−02  2.3304E−03 2.1303E−04 −4.0350E−04 A18 = —  1.0253E−03 −5.0507E−03 −2.2735E−04−8.1705E−06  2.6085E−05 A20 = — —  3.5062E−04  8.9074E−06 −1.6817E−08−7.2132E−07

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 3.92 TD/CT1 4.24 Fno 2.29 TL/f 1.24 HFOV [deg.]39.0 TL/ImgH 1.49 Nmax 1.669 (R1 + R2)/(R1 − R2) −0.27 (Vi/Ni)min 11.65R10/R9 1.66 V2 + V3 + V4 80.4 Σ|f/fi| 3.58 Vmin 19.5 |f/f3| + |f/f4|0.06 ΣCT/ΣAT 2.24 f/R1 1.70 CT1/CT2 4.19 EPD/CT1 1.97 CT1/CT5 2.16ET1/ET2 1.85 CT1/(CT2 + CT3) 1.73 Y11/CT1 0.99 CT1/(CT2 + T23 + CT3)1.17 Y11/ET1 1.42 CT1/ET1 1.43 Y62/Y11 2.82 (CT5 + CT6)/T56 1.99Yc51/Yc52 1.00 CT5/CT4 0.96 Yc62/Y62 0.45

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 590. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 500, a first lens element 510, a second lenselement 520, a stop 501, a third lens element 530, a fourth lens element540, a fifth lens element 550, a sixth lens element 560, a filter 570and an image surface 580. The photographing optical lens system includessix lens elements (510, 520, 530, 540, 550 and 560) with no additionallens element disposed between each of the adjacent six lens elements.

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being convex in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theobject-side surface 511 and the image-side surface 512 being bothaspheric. The object-side surface 511 of the first lens element 510 hasone inflection point.

The second lens element 520 with negative refractive power has anobject-side surface 521 being convex in a paraxial region thereof and animage-side surface 522 being concave in a paraxial region thereof. Thesecond lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with positive refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being concave in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric. The object-side surface 531 of the third lens element 530 hastwo inflection points. The image-side surface 532 of the third lenselement 530 has two inflection points. The object-side surface 531 ofthe third lens element 530 has two critical points in an off-axis regionthereof. The image-side surface 532 of the third lens element 530 hastwo critical points in an off-axis region thereof.

The fourth lens element 540 with negative refractive power has anobject-side surface 541 being concave in a paraxial region thereof andan image-side surface 542 being convex in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric. The object-side surface 541 of the fourth lens element 540 hastwo inflection points. The image-side surface 542 of the fourth lenselement 540 has one inflection point.

The fifth lens element 550 with positive refractive power has anobject-side surface 551 being convex in a paraxial region thereof and animage-side surface 552 being concave in a paraxial region thereof. Thefifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric. The object-side surface 551 of the fifth lens element 550 hastwo inflection points. The image-side surface 552 of the fifth lenselement 550 has one inflection point. The object-side surface 551 of thefifth lens element 550 has one critical point in an off-axis regionthereof. The image-side surface 552 of the fifth lens element 550 hasone critical point in an off-axis region thereof.

The sixth lens element 560 with negative refractive power has anobject-side surface 561 being concave in a paraxial region thereof andan image-side surface 562 being concave in a paraxial region thereof.The sixth lens element 560 is made of plastic material and has theobject-side surface 561 and the image-side surface 562 being bothaspheric. The object-side surface 561 of the sixth lens element 560 hasone inflection point. The image-side surface 562 of the sixth lenselement 560 has two inflection points. The object-side surface 561 ofthe sixth lens element 560 has one critical point in an off-axis regionthereof. The image-side surface 562 of the sixth lens element 560 hasone critical point in an off-axis region thereof.

The filter 570 is made of glass material and located between the sixthlens element 560 and the image surface 580, and will not affect thefocal length of the photographing optical lens system. The image sensor590 is disposed on or near the image surface 580 of the photographingoptical lens system.

In this embodiment, an Abbe number of the i-th lens element is Vi, arefractive index of the i-th lens element is Ni, a minimum value ofVi/Ni is (Vi/Ni)min, and (Vi/Ni)min is equal to V2/N2 and V4/N4. Inaddition, an Abbe number of the second lens element 520 is V2, an Abbenumber of the fourth lens element 540 is V4, a refractive index of thesecond lens element 520 is N2, and a refractive index of the fourth lenselement 540 is N4.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 3.79 mm, Fno = 2.28, HFOV = 40.4 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.120 2 Lens 1 2.004 (ASP) 0.844Plastic 1.545 56.1 2.68 3 −4.563 (ASP) 0.063 4 Lens 2 200.000 (ASP)0.210 Plastic 1.669 19.5 −6.21 5 4.070 (ASP) 0.180 6 Stop Plano 0.057 7Lens 3 4.350 (ASP) 0.240 Plastic 1.565 33.8 4255.75 8 4.271 (ASP) 0.3129 Lens 4 −1.791 (ASP) 0.310 Plastic 1.669 19.5 −36.52 10 −2.066 (ASP)0.030 11 Lens 5 1.418 (ASP) 0.371 Plastic 1.544 56.0 7.91 12 1.920 (ASP)0.672 13 Lens 6 −100.000 (ASP) 0.368 Plastic 1.534 55.9 −4.08 14 2.232(ASP) 0.450 15 Filter Plano 0.210 Glass 1.517 64.2 — 16 Plano 0.145 17Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 501 (Surface 6) is 0.878 mm.

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 7 8 k = −1.5496E+01−5.5585E+01 9.0000E+01 −1.2264E+01   8.5710E+00  2.1263E+00 A4 = 1.8357E−01 −1.4801E−01 8.7412E−02 8.8556E−02 −2.3534E−01 −3.1099E−02 A6= −3.5294E−01  9.7138E−02 1.7267E−01 2.0865E−01 −3.4314E−01 −8.1851E−01A8 =  4.2154E−01 −4.4872E−01 −8.8701E−01  −4.6652E−01   1.6533E+00 2.2779E+00 A10 = −4.7411E−01  9.3516E−01 1.6434E+00 3.1536E−01−2.9072E+00 −3.8957E+00 A12 =  2.9160E−01 −8.7037E−01 −1.2929E+00 1.4248E−01  2.4479E+00  4.0985E+00 A14 = −7.7511E−02  3.0741E−013.8418E−01 −1.3808E−01  −7.2029E−01 −2.4906E+00 A16 = — — — — — 7.2004E−01 Surface # 9 10 11 12 13 14 k = −7.2602E+00 −1.3595E+01−1.1865E+00 −1.8425E+01 −9.9000E+01 −4.5671E−01 A4 =  6.0771E−01 3.6393E−01 −8.4673E−02  1.7458E−01 −2.0551E−01 −2.6130E−01 A6 =−1.3400E+00 −9.4860E−01 −3.9170E−01 −3.6362E−01  5.6991E−02  1.4240E−01A8 =  1.5904E+00  1.3402E+00  7.4002E−01  2.2311E−01 −4.3622E−03−8.7934E−02 A10 = −1.1342E+00 −1.1594E+00 −1.0018E+00 −3.6420E−02 3.1197E−03  4.5044E−02 A12 =  2.0114E−01  5.2802E−01  9.1434E−01−3.7963E−02 −1.8584E−03 −1.5301E−02 A14 =  1.3908E−01 −1.0628E−01−5.1212E−01  2.6861E−02  4.1316E−04  3.2370E−03 A16 = −5.4312E−02 5.8347E−03  1.5031E−01 −7.3716E−03 −4.0515E−05 −4.1329E−04 A18 = — —−1.5630E−02  9.2674E−04  1.4787E−06  2.9383E−05 A20 = — — −6.3808E−04−4.2823E−05 — −8.9869E−07

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 3.79 TD/CT1 4.33 Fno 2.28 TL/f 1.18 HFOV [deg.]40.4 TL/ImgH 1.36 Nmax 1.669 (R1 + R2)/(R1 − R2) −0.39 (Vi/Ni)min 11.65R10/R9 1.35 V2 + V3 + V4 72.7 Σ|f/fi| 3.54 Vmin 19.5 |f/f3| + |f/f4|0.10 ΣCT/ΣAT 1.78 f/R1 1.89 CT1/CT2 4.02 EPD/CT1 1.97 CT1/CT5 2.27ET1/ET2 1.82 CT1/(CT2 + CT3) 1.88 Y11/CT1 0.99 CT1/(CT2 + T23 + CT3)1.23 Y11/ET1 1.54 CT1/ET1 1.55 Y62/Y11 2.90 (CT5 + CT6)/T56 1.10Yc51/Yc52 0.92 CT5/CT4 1.20 Yc62/Y62 0.34

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 690. The photographingoptical lens system includes, in order from an object side to an imageside, a stop 601, an aperture stop 600, a first lens element 610, a stop602, a second lens element 620, a third lens element 630, a fourth lenselement 640, a fifth lens element 650, a sixth lens element 660, afilter 670 and an image surface 680. The photographing optical lenssystem includes six lens elements (610, 620, 630, 640, 650 and 660) withno additional lens element disposed between each of the adjacent sixlens elements.

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being convex in a paraxial region thereof. Thefirst lens element 610 is made of plastic material and has theobject-side surface 611 and the image-side surface 612 being bothaspheric. The object-side surface 611 of the first lens element 610 hasone inflection point.

The second lens element 620 with negative refractive power has anobject-side surface 621 being concave in a paraxial region thereof andan image-side surface 622 being concave in a paraxial region thereof.The second lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric. The object-side surface 621 of the second lens element 620 hasone inflection point. The object-side surface 621 of the second lenselement 620 has one critical point in an off-axis region thereof.

The third lens element 630 with negative refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being concave in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric. The object-side surface 631 of the third lens element 630 hasone inflection point. The image-side surface 632 of the third lenselement 630 has two inflection points. The object-side surface 631 ofthe third lens element 630 has one critical point in an off-axis regionthereof. The image-side surface 632 of the third lens element 630 hastwo critical points in an off-axis region thereof.

The fourth lens element 640 with negative refractive power has anobject-side surface 641 being concave in a paraxial region thereof andan image-side surface 642 being convex in a paraxial region thereof. Thefourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric. The object-side surface 641 of the fourth lens element 640 hasthree inflection points. The image-side surface 642 of the fourth lenselement 640 has two inflection points.

The fifth lens element 650 with positive refractive power has anobject-side surface 651 being convex in a paraxial region thereof and animage-side surface 652 being concave in a paraxial region thereof. Thefifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric. The object-side surface 651 of the fifth lens element 650 hasthree inflection points. The image-side surface 652 of the fifth lenselement 650 has three inflection points. The object-side surface 651 ofthe fifth lens element 650 has one critical point in an off-axis regionthereof. The image-side surface 652 of the fifth lens element 650 hasone critical point in an off-axis region thereof.

The sixth lens element 660 with negative refractive power has anobject-side surface 661 being convex in a paraxial region thereof and animage-side surface 662 being concave in a paraxial region thereof. Thesixth lens element 660 is made of plastic material and has theobject-side surface 661 and the image-side surface 662 being bothaspheric. The object-side surface 661 of the sixth lens element 660 hastwo inflection points. The image-side surface 662 of the sixth lenselement 660 has two inflection points. The object-side surface 661 ofthe sixth lens element 660 has one critical point in an off-axis regionthereof. The image-side surface 662 of the sixth lens element 660 hasone critical point in an off-axis region thereof.

The filter 670 is made of glass material and located between the sixthlens element 660 and the image surface 680, and will not affect thefocal length of the photographing optical lens system. The image sensor690 is disposed on or near the image surface 680 of the photographingoptical lens system.

In this embodiment, an Abbe number of the i-th lens element is Vi, arefractive index of the i-th lens element is Ni, a minimum value ofVi/Ni is (Vi/Ni)min, and (Vi/Ni)min is equal to V2/N2 and V4/N4. Inaddition, an Abbe number of the second lens element 620 is V2, an Abbenumber of the fourth lens element 640 is V4, a refractive index of thesecond lens element 620 is N2, and a refractive index of the fourth lenselement 640 is N4.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 3.67 mm, Fno = 2.30, HFOV = 40.9 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano 350.000 1 Stop Plano 0.110 2 Ape. Stop Plano −0.100 3Lens 1 2.077 (ASP) 0.882 Plastic 1.545 56.1 2.47 4 −3.248 (ASP) 0.068 5Stop Plano −0.036 6 Lens 2 −10.043 (ASP) 0.210 Plastic 1.669 19.5 −4.697 4.603 (ASP) 0.230 8 Lens 3 2.432 (ASP) 0.235 Plastic 1.584 28.2−122.64 9 2.268 (ASP) 0.390 10 Lens 4 −2.616 (ASP) 0.332 Plastic 1.66919.5 −54.06 11 −2.963 (ASP) 0.032 12 Lens 5 1.426 (ASP) 0.366 Plastic1.544 56.0 6.65 13 2.140 (ASP) 0.549 14 Lens 6 3.428 (ASP) 0.340 Plastic1.534 55.9 −4.19 15 1.307 (ASP) 0.400 16 Filter Plano 0.210 Glass 1.51764.2 — 17 Plano 0.284 18 Image Plano — Note: Reference wavelength is587.6 nm (d-line). An effective radius of the stop 601 (Surface 1) is0.880 mm. An effective radius of the stop 602 (Surface 5) is 0.845 mm.

TABLE 12 Aspheric Coefficients Surface # 3 4 6 7 8 9 k = −8.1564E+00−9.9000E+01 −8.8922E+01  7.5624E+00 −1.5157E+00 −4.1931E+00 A4 = 4.6804E−02  1.6874E−01 7.4019E−01 2.2713E−01 −2.9032E−01 −1.3040E−01 A6=  1.1788E−01 −1.3618E+00 −2.3959E+00  −1.2723E−03  −3.1681E−02−3.7235E−01 A8 = −1.3316E+00  1.4934E+00 4.0362E+00 −1.0774E+00  8.7968E−01  1.1992E+00 A10 =  4.4482E+00  2.3464E+00 −3.2965E+00 2.5331E+00 −1.8801E+00 −1.8751E+00 A12 = −8.1313E+00 −7.4345E+001.0637E+00 −2.4108E+00   1.7945E+00  1.5920E+00 A14 =  7.6364E+00 6.9179E+00 2.1623E−02 8.7741E−01 −6.5939E−01 −6.7849E−01 A16 =−2.8954E+00 −2.2786E+00 — — —  1.1961E−01 Surface # 10 11 12 13 14 15 k= −1.6522E+00 −4.7054E+00  −9.5631E−01 −2.4426E+01  4.5968E−01−1.1723E+00 A4 =  5.5095E−01 4.3211E−01 −5.3205E−02  1.6569E−01−4.3845E−01 −4.7783E−01 A6 = −8.8537E−01 −8.7255E−01  −2.8624E−01−2.9993E−01  2.3808E−01  3.8213E−01 A8 =  6.0388E−01 9.8081E−01 4.9075E−01  2.5254E−01 −9.6969E−02 −2.4748E−01 A10 =  1.7888E−01−6.1620E−01  −5.7298E−01 −1.6438E−01  5.1229E−02  1.1696E−01 A12 =−6.9275E−01 1.4737E−01  4.4690E−01  7.9295E−02 −2.4346E−02 −3.7041E−02A14 =  4.3297E−01 2.5897E−02 −2.2520E−01 −2.5171E−02  7.3133E−03 7.4859E−03 A16 = −8.3693E−02 −1.7314E−02   6.8983E−02  4.7966E−03−1.2742E−03 −9.2050E−04 A18 = — 1.8907E−03 −1.1462E−02 −4.8843E−04 1.1873E−04  6.2608E−05 A20 = — —  7.8257E−04  2.0062E−05 −4.5954E−06−1.8031E−06

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 3.67 TD/CT1 4.08 Fno 2.30 TL/f 1.22 HFOV [deg.]40.9 TL/ImgH 1.37 Nmax 1.669 (R1 + R2)/(R1 − R2) −0.22 (Vi/Ni)min 11.65R10/R9 1.50 V2 + V3 + V4 67.1 Σ|f/fi| 3.80 Vmin 19.5 |f/f3| + |f/f4|0.10 ΣCT/ΣAT 1.92 f/R1 1.77 CT1/CT2 4.20 EPD/CT1 1.84 CT1/CT5 2.41ET1/ET2 1.90 CT1/(CT2 + CT3) 1.98 Y11/CT1 0.93 CT1/(CT2 + T23 + CT3)1.31 Y11/ET1 1.33 CT1/ET1 1.44 Y62/Y11 2.98 (CT5 + CT6)/T56 1.29Yc51/Yc52 0.96 CT5/CT4 1.10 Yc62/Y62 0.38

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 790. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 700, a first lens element 710, a stop 701, asecond lens element 720, a third lens element 730, a fourth lens element740, a fifth lens element 750, a sixth lens element 760, a filter 770and an image surface 780. The photographing optical lens system includessix lens elements (710, 720, 730, 740, 750 and 760) with no additionallens element disposed between each of the adjacent six lens elements.

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being convex in a paraxial region thereof. Thefirst lens element 710 is made of plastic material and has theobject-side surface 711 and the image-side surface 712 being bothaspheric. The object-side surface 711 of the first lens element 710 hasone inflection point.

The second lens element 720 with negative refractive power has anobject-side surface 721 being convex in a paraxial region thereof and animage-side surface 722 being concave in a paraxial region thereof. Thesecond lens element 720 is made of plastic material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric.

The third lens element 730 with negative refractive power has anobject-side surface 731 being convex in a paraxial region thereof and animage-side surface 732 being concave in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric. The object-side surface 731 of the third lens element 730 hastwo inflection points. The image-side surface 732 of the third lenselement 730 has two inflection points. The object-side surface 731 ofthe third lens element 730 has two critical points in an off-axis regionthereof. The image-side surface 732 of the third lens element 730 hastwo critical points in an off-axis region thereof.

The fourth lens element 740 with positive refractive power has anobject-side surface 741 being concave in a paraxial region thereof andan image-side surface 742 being convex in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric. The object-side surface 741 of the fourth lens element 740 hasthree inflection points. The image-side surface 742 of the fourth lenselement 740 has four inflection points. The object-side surface 741 ofthe fourth lens element 740 has two critical points in an off-axisregion thereof.

The fifth lens element 750 with negative refractive power has anobject-side surface 751 being convex in a paraxial region thereof and animage-side surface 752 being concave in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric. The object-side surface 751 of the fifth lens element 750 hasthree inflection points. The image-side surface 752 of the fifth lenselement 750 has one inflection point. The object-side surface 751 of thefifth lens element 750 has one critical point in an off-axis regionthereof. The image-side surface 752 of the fifth lens element 750 hasone critical point in an off-axis region thereof.

The sixth lens element 760 with negative refractive power has anobject-side surface 761 being convex in a paraxial region thereof and animage-side surface 762 being concave in a paraxial region thereof. Thesixth lens element 760 is made of plastic material and has theobject-side surface 761 and the image-side surface 762 being bothaspheric. The object-side surface 761 of the sixth lens element 760 hasthree inflection points. The image-side surface 762 of the sixth lenselement 760 has three inflection points. The object-side surface 761 ofthe sixth lens element 760 has three critical points in an off-axisregion thereof. The image-side surface 762 of the sixth lens element 760has one critical point in an off-axis region thereof.

The filter 770 is made of glass material and located between the sixthlens element 760 and the image surface 780, and will not affect thefocal length of the photographing optical lens system. The image sensor790 is disposed on or near the image surface 780 of the photographingoptical lens system.

In this embodiment, an Abbe number of the i-th lens element is Vi, arefractive index of the i-th lens element is Ni, a minimum value ofVi/Ni is (Vi/Ni)min, and (Vi/Ni)min is equal to V2/N2, V3/N3 and V4/N4.In addition, an Abbe number of the second lens element 720 is V2, anAbbe number of the third lens element 730 is V3, an Abbe number of thefourth lens element 740 is V4, a refractive index of the second lenselement 720 is N2, a refractive index of the third lens element 730 isN3, and a refractive index of the fourth lens element 740 is N4.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 3.71 mm, Fno = 2.30, HFOV = 40.8 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano 350.000 1 Ape. Stop Plano −0.100 2 Lens 1 2.087 (ASP)0.878 Plastic 1.525 58.1 3.02 3 −5.679 (ASP) 0.085 4 Stop Plano −0.055 5Lens 2 5.810 (ASP) 0.150 Plastic 1.679 18.4 −10.00 6 3.099 (ASP) 0.309 7Lens 3 4.933 (ASP) 0.180 Plastic 1.679 18.4 −34.21 8 4.009 (ASP) 0.246 9Lens 4 −3.443 (ASP) 0.296 Plastic 1.679 18.4 15.96 10 −2.704 (ASP) 0.10511 Lens 5 1.542 (ASP) 0.314 Plastic 1.562 44.6 −123.02 12 1.398 (ASP)0.480 13 Lens 6 2.814 (ASP) 0.607 Plastic 1.544 56.0 −6.67 14 1.465(ASP) 0.400 15 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano 0.385 17Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 701 (Surface 4) is 0.850 mm.

TABLE 14 Aspheric Coefficients Surface # 2 3 5 6 7 8 k = −7.6376E+00−2.4578E+01 −5.3584E+01  −5.6143E+00   8.1745E+00  1.5754E+00 A4 = 5.4787E−02 −1.4855E−01 9.1149E−02 1.1624E−01 −2.3834E−01 −4.3388E−02 A6= −4.9341E−02 −1.4496E−01 1.7402E−01 3.4257E−01 −3.7007E−01 −9.4347E−01A8 = −4.8127E−01  8.0611E−01 −1.4360E+00  −1.7050E+00   2.0460E+00 2.6861E+00 A10 =  2.1290E+00 −2.5979E+00 3.3863E+00 3.2058E+00−3.9968E+00 −4.0359E+00 A12 = −4.5598E+00  5.2810E+00 −3.2494E+00 −2.6959E+00   3.6833E+00  3.1619E+00 A14 =  4.7228E+00 −5.4718E+001.1537E+00 8.9358E−01 −1.2547E+00 −1.0756E+00 A16 = −1.9074E+00 2.1868E+00 — — —  1.1068E−01 Surface # 9 10 11 12 13 14 k =  2.5683E+00−7.0083E+01 −6.3689E−01 −1.4145E+01 −5.9193E−01 −1.0016E+00 A4 = 8.1402E−01  5.2875E−01  1.2459E−01  1.7108E−01 −4.1473E−01 −3.7540E−01A6 = −2.0134E+00 −1.5508E+00 −8.8033E−01 −2.3113E−01  2.2624E−01 2.5386E−01 A8 =  2.9474E+00  2.4115E+00  1.6732E+00  5.2710E−02−7.7966E−02 −1.4545E−01 A10 = −2.5631E+00 −2.2816E+00 −2.2670E+00 4.8024E−02  2.6306E−02  5.8206E−02 A12 =  9.6960E−01  1.2285E+00 2.0145E+00 −3.9503E−02 −8.3982E−03 −1.4598E−02 A14 = −2.9465E−03−3.4702E−01 −1.1329E+00  1.3373E−02  1.8815E−03  2.0799E−03 A16 =−5.6337E−02  4.4397E−02  3.8488E−01 −2.4533E−03 −2.5169E−04 −1.3647E−04A18 = — −1.8947E−03 −7.1280E−02  2.3768E−04  1.7869E−05  4.3110E−07 A20= — —  5.4723E−03 −9.4866E−06 −5.1639E−07  2.5832E−07

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 3.71 TD/CT1 4.09 Fno 2.30 TL/f 1.21 HFOV [deg.]40.8 TL/ImgH 1.37 Nmax 1.679 (R1 + R2)/(R1 − R2) −0.46 (Vi/Ni)min 10.98R10/R9 0.91 V2 + V3 + V4 55.3 Σ|f/fi| 2.52 Vmin 18.4 |f/f3| + |f/f4|0.34 ΣCT/ΣAT 2.07 f/R1 1.78 CT1/CT2 5.85 EPD/CT1 1.87 CT1/CT5 2.80ET1/ET2 2.62 CT1/(CT2 + CT3) 2.66 Y11/CT1 0.94 CT1/(CT2 + T23 + CT3)1.37 Y11/ET1 1.35 CT1/ET1 1.44 Y62/Y11 2.97 (CT5 + CT6)/T56 1.92Yc51/Yc52 0.84 CT5/CT4 1.06 Yc62/Y62 0.39

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 890. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 800, a first lens element 810, a stop 801, asecond lens element 820, a third lens element 830, a fourth lens element840, a fifth lens element 850, a sixth lens element 860, a filter 870and an image surface 880. The photographing optical lens system includessix lens elements (810, 820, 830, 840, 850 and 860) with no additionallens element disposed between each of the adjacent six lens elements.

The first lens element 810 with positive refractive power has anobject-side surface 811 being convex in a paraxial region thereof and animage-side surface 812 being convex in a paraxial region thereof. Thefirst lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric. The object-side surface 811 of the first lens element 810 hasone inflection point.

The second lens element 820 with negative refractive power has anobject-side surface 821 being convex in a paraxial region thereof and animage-side surface 822 being concave in a paraxial region thereof. Thesecond lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric.

The third lens element 830 with negative refractive power has anobject-side surface 831 being convex in a paraxial region thereof and animage-side surface 832 being concave in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric. The object-side surface 831 of the third lens element 830 hastwo inflection points. The image-side surface 832 of the third lenselement 830 has two inflection points. The object-side surface 831 ofthe third lens element 830 has two critical points in an off-axis regionthereof. The image-side surface 832 of the third lens element 830 hastwo critical points in an off-axis region thereof.

The fourth lens element 840 with negative refractive power has anobject-side surface 841 being concave in a paraxial region thereof andan image-side surface 842 being convex in a paraxial region thereof. Thefourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric. The object-side surface 841 of the fourth lens element 840 hastwo inflection points. The image-side surface 842 of the fourth lenselement 840 has two inflection points. The object-side surface 841 ofthe fourth lens element 840 has two critical points in an off-axisregion thereof. The image-side surface 842 of the fourth lens element840 has two critical points in an off-axis region thereof.

The fifth lens element 850 with positive refractive power has anobject-side surface 851 being convex in a paraxial region thereof and animage-side surface 852 being concave in a paraxial region thereof. Thefifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric. The object-side surface 851 of the fifth lens element 850 hastwo inflection points. The image-side surface 852 of the fifth lenselement 850 has one inflection point. The object-side surface 851 of thefifth lens element 850 has one critical point in an off-axis regionthereof. The image-side surface 852 of the fifth lens element 850 hasone critical point in an off-axis region thereof.

The sixth lens element 860 with negative refractive power has anobject-side surface 861 being convex in a paraxial region thereof and animage-side surface 862 being concave in a paraxial region thereof. Thesixth lens element 860 is made of plastic material and has theobject-side surface 861 and the image-side surface 862 being bothaspheric. The object-side surface 861 of the sixth lens element 860 hasthree inflection points. The image-side surface 862 of the sixth lenselement 860 has two inflection points. The object-side surface 861 ofthe sixth lens element 860 has two critical points in an off-axis regionthereof. The image-side surface 862 of the sixth lens element 860 hasone critical point in an off-axis region thereof.

The filter 870 is made of glass material and located between the sixthlens element 860 and the image surface 880, and will not affect thefocal length of the photographing optical lens system. The image sensor890 is disposed on or near the image surface 880 of the photographingoptical lens system.

In this embodiment, an Abbe number of the i-th lens element is Vi, arefractive index of the i-th lens element is Ni, a minimum value ofVi/Ni is (Vi/Ni)min, and (Vi/Ni)min is equal to V2/N2 and V4/N4. Inaddition, an Abbe number of the second lens element 820 is V2, an Abbenumber of the fourth lens element 840 is V4, a refractive index of thesecond lens element 820 is N2, and a refractive index of the fourth lenselement 840 is N4.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 5.22 mm, Fno = 1.99, HFOV = 41.0 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano 500.000 1 Ape. Stop Plano −0.143 2 Lens 1 3.286 (ASP)1.333 Plastic 1.535 57.2 4.20 3 −6.086 (ASP) 0.138 4 Stop Plano −0.055 5Lens 2 14.240 (ASP) 0.157 Plastic 1.690 16.5 −14.90 6 5.944 (ASP) 0.4947 Lens 3 8.392 (ASP) 0.219 Plastic 1.614 26.0 −34.13 8 5.932 (ASP) 0.3609 Lens 4 −4.045 (ASP) 0.443 Plastic 1.690 16.5 −174.22 10 −4.373 (ASP)0.066 11 Lens 5 1.817 (ASP) 0.519 Plastic 1.535 57.2 17.17 12 2.039(ASP) 0.713 13 Lens 6 4.148 (ASP) 0.813 Plastic 1.535 57.2 −8.20 141.986 (ASP) 0.500 15 Filter Plano 0.300 Glass 1.517 64.2 — 16 Plano0.502 17 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).An effective radius of the stop 801 (Surface 4) is 1.297 mm. Aneffective radius of the image-side surface 862 (Surface 14) is 3.571 mm.

TABLE 16 Aspheric Coefficients Surface # 2 3 5 6 7 8 k = −7.9274E+00−3.0964E+01 −2.1752E+01  −8.0473E+00  −3.1379E+00 −7.5498E−01 A4 = 1.3526E−02 −7.3183E−02 1.2913E−02 4.0334E−02 −6.2544E−02  1.7234E−02 A6= −1.4863E−02  5.9026E−02 7.9927E−02 4.4171E−02 −1.4580E−01 −2.3004E−01A8 = −4.8826E−03 −6.4595E−02 −1.4611E−01  −8.9044E−02   2.8325E−01 2.7549E−01 A10 =  1.8090E−02  3.5521E−02 1.1720E−01 6.3109E−02−2.3348E−01 −1.6857E−01 A12 = −1.9493E−02 −4.3888E−03 −4.2217E−02 −1.7949E−02   9.3015E−02  5.0382E−02 A14 =  8.9273E−03 −3.1361E−035.7652E−03 1.8460E−03 −1.3831E−02 −4.9970E−03 A16 = −1.5176E−03 8.8359E−04 — — — −1.2779E−04 Surface # 9 10 11 12 13 14 k = −1.2641E+01−9.9000E+01  −9.0200E−01 −1.4803E+01 −5.7790E−01 −1.0312E+00 A4 = 2.9150E−01 1.5940E−01 −1.8391E−02  4.8287E−02 −1.3387E−01 −1.2864E−01A6 = −3.4082E−01 −1.9862E−01  −8.5083E−02 −3.0499E−02  3.1151E−02 4.1449E−02 A8 =  2.2426E−01 1.2884E−01  9.4167E−02  3.1190E−03−3.1639E−03 −1.1120E−02 A10 = −8.9761E−02 −4.9962E−02  −6.7790E−02 1.5131E−03  1.0008E−04  2.1655E−03 A12 =  1.8507E−02 1.0527E−02 3.0536E−02 −5.8931E−04  9.4033E−06 −2.8383E−04 A14 = −1.5636E−03−1.0174E−03  −8.5054E−03  9.6374E−05 −1.2416E−06  2.3843E−05 A16 = 1.9636E−05 2.1670E−05  1.4100E−03 −8.5274E−06  7.0787E−08 −1.2194E−06A18 = — 1.2282E−06 −1.2624E−04  3.9532E−07 −2.3568E−09  3.4513E−08 A20 =— —  4.6673E−06 −7.4847E−09  3.5647E−11 −4.1571E−10

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 5.22 TD/CT1 3.90 Fno 1.99 TL/f 1.25 HFOV [deg.]41.0 TL/ImgH 1.39 Nmax 1.690 (R1 + R2)/(R1 − R2) −0.30 (Vi/Ni)min 9.76R10/R9 1.12 V2 + V3 + V4 59.0 Σ|f/fi| 2.72 Vmin 16.5 |f/f3| + |f/f4|0.18 ΣCT/ΣAT 2.03 f/R1 1.59 CT1/CT2 8.49 EPD/CT1 2.00 CT1/CT5 2.57ET1/ET2 3.28 CT1/(CT2 + CT3) 3.55 Y11/CT1 1.00 CT1/(CT2 + T23 + CT3)1.53 Y11/ET1 1.54 CT1/ET1 1.53 Y62/Y11 2.67 (CT5 + CT6)/T56 1.87Yc51/Yc52 0.84 CT5/CT4 1.17 Yc62/Y62 0.40

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 990. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 900, a first lens element 910, a stop 901, asecond lens element 920, a third lens element 930, a fourth lens element940, a fifth lens element 950, a sixth lens element 960, a filter 970and an image surface 980. The photographing optical lens system includessix lens elements (910, 920, 930, 940, 950 and 960) with no additionallens element disposed between each of the adjacent six lens elements.

The first lens element 910 with positive refractive power has anobject-side surface 911 being convex in a paraxial region thereof and animage-side surface 912 being convex in a paraxial region thereof. Thefirst lens element 910 is made of plastic material and has theobject-side surface 911 and the image-side surface 912 being bothaspheric. The object-side surface 911 of the first lens element 910 hasone inflection point.

The second lens element 920 with negative refractive power has anobject-side surface 921 being concave in a paraxial region thereof andan image-side surface 922 being concave in a paraxial region thereof.The second lens element 920 is made of plastic material and has theobject-side surface 921 and the image-side surface 922 being bothaspheric. The object-side surface 921 of the second lens element 920 hasthree inflection points. The image-side surface 922 of the second lenselement 920 has one inflection point. The object-side surface 921 of thesecond lens element 920 has one critical point in an off-axis regionthereof.

The third lens element 930 with negative refractive power has anobject-side surface 931 being convex in a paraxial region thereof and animage-side surface 932 being concave in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theobject-side surface 931 and the image-side surface 932 being bothaspheric. The object-side surface 931 of the third lens element 930 hasthree inflection points. The image-side surface 932 of the third lenselement 930 has two inflection points. The object-side surface 931 ofthe third lens element 930 has one critical point in an off-axis regionthereof. The image-side surface 932 of the third lens element 930 hastwo critical points in an off-axis region thereof.

The fourth lens element 940 with negative refractive power has anobject-side surface 941 being concave in a paraxial region thereof andan image-side surface 942 being convex in a paraxial region thereof. Thefourth lens element 940 is made of plastic material and has theobject-side surface 941 and the image-side surface 942 being bothaspheric. The object-side surface 941 of the fourth lens element 940 hasthree inflection points. The image-side surface 942 of the fourth lenselement 940 has two inflection points.

The fifth lens element 950 with positive refractive power has anobject-side surface 951 being convex in a paraxial region thereof and animage-side surface 952 being concave in a paraxial region thereof. Thefifth lens element 950 is made of plastic material and has theobject-side surface 951 and the image-side surface 952 being bothaspheric. The object-side surface 951 of the fifth lens element 950 hasthree inflection points. The image-side surface 952 of the fifth lenselement 950 has three inflection points. The object-side surface 951 ofthe fifth lens element 950 has one critical point in an off-axis regionthereof. The image-side surface 952 of the fifth lens element 950 hasone critical point in an off-axis region thereof.

The sixth lens element 960 with negative refractive power has anobject-side surface 961 being convex in a paraxial region thereof and animage-side surface 962 being concave in a paraxial region thereof. Thesixth lens element 960 is made of plastic material and has theobject-side surface 961 and the image-side surface 962 being bothaspheric. The object-side surface 961 of the sixth lens element 960 hasfour inflection points. The image-side surface 962 of the sixth lenselement 960 has two inflection points. The object-side surface 961 ofthe sixth lens element 960 has one critical point in an off-axis regionthereof. The image-side surface 962 of the sixth lens element 960 hasone critical point in an off-axis region thereof.

The filter 970 is made of glass material and located between the sixthlens element 960 and the image surface 980, and will not affect thefocal length of the photographing optical lens system. The image sensor990 is disposed on or near the image surface 980 of the photographingoptical lens system.

In this embodiment, an Abbe number of the i-th lens element is Vi, arefractive index of the i-th lens element is Ni, a minimum value ofVi/Ni is (Vi/Ni)min, and (Vi/Ni)min is equal to V2/N2. In addition, anAbbe number of the second lens element 920 is V2, and a refractive indexof the second lens element 920 is N2.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 3.61 mm, Fno = 2.31, HFOV = 41.1 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano 350.000 1 Ape. Stop Plano −0.100 2 Lens 1 2.152 (ASP)0.914 Plastic 1.545 55.9 2.69 3 −3.905 (ASP) 0.019 4 Stop Plano 0.011 5Lens 2 −42.595 (ASP) 0.200 Plastic 1.669 19.5 −5.19 6 3.784 (ASP) 0.2347 Lens 3 2.937 (ASP) 0.255 Plastic 1.587 28.3 −120.86 8 2.730 (ASP)0.366 9 Lens 4 −4.935 (ASP) 0.321 Plastic 1.587 28.3 −108.90 10 −5.476(ASP) 0.077 11 Lens 5 1.480 (ASP) 0.376 Plastic 1.544 56.0 5.01 12 2.946(ASP) 0.511 13 Lens 6 4.296 (ASP) 0.319 Plastic 1.534 55.9 −3.54 141.277 (ASP) 0.400 15 Filter Plano 0.210 Glass 1.517 64.2 — 16 Plano0.277 17 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).An effective radius of the stop 901 (Surface 4) is 0.875 mm.

TABLE 18 Aspheric Coefficients Surface # 2 3 5 6 7 8 k = −8.0822E+00−9.5221E+01 −8.7180E+01 −2.7261E+01  1.8646E−01 −6.9897E+00 A4 = 4.2379E−02  1.4055E−01  4.7771E−01  1.8292E−01 −3.2132E−01 −2.0633E−01A6 =  1.6221E−01 −1.4389E+00 −1.7850E+00 −4.3279E−02  2.5906E−01 2.7187E−02 A8 = −1.3804E+00  2.5674E+00  2.7828E+00 −8.5678E−01−1.3373E−01 −4.4755E−02 A10 =  4.3719E+00 −9.0083E−01 −1.4939E+00 1.9530E+00  3.0948E−01  4.3468E−01 A12 = −7.7132E+00 −2.4296E+00−3.9518E−01 −1.6782E+00 −1.2328E+00 −9.3693E−01 A14 =  7.1408E+00 2.8798E+00  4.7969E−01  5.0489E−01  1.6131E+00  7.8127E−01 A16 =−2.7206E+00 −9.3858E−01 — — −6.5658E−01 −2.0524E−01 Surface # 9 10 11 1213 14 k =  8.6353E+00 7.3813E+00 −4.2135E−01 −2.4023E+01 7.6475E−01−1.3857E+00 A4 =  3.5477E−01 2.2456E−01 −4.0434E−02  2.2008E−01−3.9677E−01  −4.7220E−01 A6 = −3.7288E−01 −4.2423E−01  −4.5871E−01−5.9557E−01 1.9919E−03  3.2706E−01 A8 = −4.0136E−01 2.8418E−01 6.3433E−01  6.2324E−01 2.7045E−01 −1.4410E−01 A10 =  1.4491E+001.7858E−01 −5.2801E−01 −3.6590E−01 −1.9815E−01   4.4384E−02 A12 =−1.6882E+00 −4.9752E−01   3.0855E−01  1.3304E−01 6.9640E−02 −1.0133E−02A14 =  8.5675E−01 3.5865E−01 −1.3663E−01 −3.0872E−02 −1.4045E−02  1.6859E−03 A16 = −1.5610E−01 −1.1023E−01   4.2701E−02  4.4545E−031.6606E−03 −1.8903E−04 A18 = — 1.2349E−02 −7.8057E−03 −3.6171E−04−1.0716E−04   1.2486E−05 A20 = — —  6.0057E−04  1.2461E−05 2.9120E−06−3.6169E−07

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 3.61 TD/CT1 3.94 Fno 2.31 TL/f 1.24 HFOV [deg.]41.1 TL/ImgH 1.37 Nmax 1.669 (R1 + R2)/(R1 − R2) −0.29 (Vi/Ni)min 11.65R10/R9 1.99 V2 + V3 + V4 76.1 Σ|f/fi| 3.85 Vmin 19.5 |f/f3| + |f/f4|0.06 ΣCT/ΣAT 1.96 f/R1 1.68 CT1/CT2 4.57 EPD/CT1 1.74 CT1/CT5 2.43ET1/ET2 2.08 CT1/(CT2 + CT3) 2.01 Y11/CT1 0.88 CT1/(CT2 + T23 + CT3)1.33 Y11/ET1 1.24 CT1/ET1 1.41 Y62/Y11 3.11 (CT5 + CT6)/T56 1.36Yc51/Yc52 0.84 CT5/CT4 1.17 Yc62/Y62 0.37

10th Embodiment

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure. FIG. 20 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 10thembodiment. In FIG. 19, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 1090. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 1000, a first lens element 1010, a stop 1001, asecond lens element 1020, a third lens element 1030, a fourth lenselement 1040, a fifth lens element 1050, a sixth lens element 1060, afilter 1070 and an image surface 1080. The photographing optical lenssystem includes six lens elements (1010, 1020, 1030, 1040, 1050 and1060) with no additional lens element disposed between each of theadjacent six lens elements.

The first lens element 1010 with positive refractive power has anobject-side surface 1011 being convex in a paraxial region thereof andan image-side surface 1012 being convex in a paraxial region thereof.The first lens element 1010 is made of plastic material and has theobject-side surface 1011 and the image-side surface 1012 being bothaspheric. The object-side surface 1011 of the first lens element 1010has one inflection point.

The second lens element 1020 with negative refractive power has anobject-side surface 1021 being concave in a paraxial region thereof andan image-side surface 1022 being concave in a paraxial region thereof.The second lens element 1020 is made of plastic material and has theobject-side surface 1021 and the image-side surface 1022 being bothaspheric. The object-side surface 1021 of the second lens element 1020has one inflection point. The object-side surface 1021 of the secondlens element 1020 has one critical point in an off-axis region thereof.

The third lens element 1030 with negative refractive power has anobject-side surface 1031 being convex in a paraxial region thereof andan image-side surface 1032 being concave in a paraxial region thereof.The third lens element 1030 is made of plastic material and has theobject-side surface 1031 and the image-side surface 1032 being bothaspheric. The object-side surface 1031 of the third lens element 1030has two inflection points. The image-side surface 1032 of the third lenselement 1030 has two inflection points. The object-side surface 1031 ofthe third lens element 1030 has one critical point in an off-axis regionthereof. The image-side surface 1032 of the third lens element 1030 hastwo critical points in an off-axis region thereof.

The fourth lens element 1040 with positive refractive power has anobject-side surface 1041 being concave in a paraxial region thereof andan image-side surface 1042 being convex in a paraxial region thereof.The fourth lens element 1040 is made of plastic material and has theobject-side surface 1041 and the image-side surface 1042 being bothaspheric. The object-side surface 1041 of the fourth lens element 1040has three inflection points. The image-side surface 1042 of the fourthlens element 1040 has two inflection points.

The fifth lens element 1050 with positive refractive power has anobject-side surface 1051 being convex in a paraxial region thereof andan image-side surface 1052 being concave in a paraxial region thereof.The fifth lens element 1050 is made of plastic material and has theobject-side surface 1051 and the image-side surface 1052 being bothaspheric. The object-side surface 1051 of the fifth lens element 1050has three inflection points. The image-side surface 1052 of the fifthlens element 1050 has one inflection point. The object-side surface 1051of the fifth lens element 1050 has one critical point in an off-axisregion thereof. The image-side surface 1052 of the fifth lens element1050 has one critical point in an off-axis region thereof.

The sixth lens element 1060 with negative refractive power has anobject-side surface 1061 being convex in a paraxial region thereof andan image-side surface 1062 being concave in a paraxial region thereof.The sixth lens element 1060 is made of plastic material and has theobject-side surface 1061 and the image-side surface 1062 being bothaspheric. The object-side surface 1061 of the sixth lens element 1060has two inflection points. The image-side surface 1062 of the sixth lenselement 1060 has two inflection points. The object-side surface 1061 ofthe sixth lens element 1060 has one critical point in an off-axis regionthereof. The image-side surface 1062 of the sixth lens element 1060 hasone critical point in an off-axis region thereof.

The filter 1070 is made of glass material and located between the sixthlens element 1060 and the image surface 1080, and will not affect thefocal length of the photographing optical lens system. The image sensor1090 is disposed on or near the image surface 1080 of the photographingoptical lens system.

In this embodiment, an Abbe number of the i-th lens element is Vi, arefractive index of the i-th lens element is Ni, a minimum value ofVi/Ni is (Vi/Ni)min, and (Vi/Ni)min is equal to V2/N2 and V4/N4. Inaddition, an Abbe number of the second lens element 1020 is V2, an Abbenumber of the fourth lens element 1040 is V4, a refractive index of thesecond lens element 1020 is N2, and a refractive index of the fourthlens element 1040 is N4.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th embodiment f = 3.87 mm, Fno = 2.25, HFOV = 39.2 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano 400.000 1 Ape. Stop Plano −0.100 2 Lens 1 2.278 (ASP)0.974 Plastic 1.545 56.1 2.50 3 −2.886 (ASP) 0.079 4 Stop Plano −0.028 5Lens 2 −20.614 (ASP) 0.257 Plastic 1.669 19.5 −4.86 6 3.877 (ASP) 0.2447 Lens 3 3.148 (ASP) 0.241 Plastic 1.584 28.2 −36.33 8 2.664 (ASP) 0.3789 Lens 4 −2.580 (ASP) 0.356 Plastic 1.669 19.5 146.18 10 −2.652 (ASP)0.041 11 Lens 5 1.591 (ASP) 0.373 Plastic 1.544 56.0 7.15 12 2.471 (ASP)0.409 13 Lens 6 3.314 (ASP) 0.340 Plastic 1.534 55.9 −4.14 14 1.278(ASP) 0.400 15 Filter Plano 0.210 Glass 1.517 64.2 — 16 Plano 0.454 17Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 1001 (Surface 4) is 0.845 mm.

TABLE 20 Aspheric Coefficients Surface # 2 3 5 6 7 8 k = −1.0497E+01−6.1365E+01 −4.5286E+01 −3.6982E+00  2.9089E+00 −3.9355E+00 A4 = 5.4899E−02 −3.7865E−02  4.5588E−01  1.9834E−01 −2.6575E−01 −1.2353E−01A6 = −1.3923E−02 −4.4128E−01 −1.3834E+00 −2.2645E−01 −9.6969E−02−3.8233E−01 A8 = −3.5338E−01  4.5018E−01  2.6274E+00  2.1441E−01 8.3135E−01  1.0712E+00 A10 =  9.4858E−01  1.0603E+00 −3.0128E+00−1.5057E−01 −1.4111E+00 −1.4391E+00 A12 = −1.3966E+00 −3.1640E+00 2.0125E+00  1.0836E−01  1.0988E+00  1.0345E+00 A14 =  1.0724E+00 3.0920E+00 −5.7946E−01 −1.6953E−02 −3.2153E−01 −3.4575E−01 A16 =−3.3953E−01 −1.0914E+00 — — —  4.1334E−02 Surface # 9 10 11 12 13 14 k =−1.3656E+00 −4.1862E+00 −8.7086E−01 −4.3404E+01  5.7361E−01 −1.0270E+00A4 =  5.8007E−01  3.9948E−01 −2.3170E−01  1.7841E−03 −4.0063E−01−4.3556E−01 A6 = −1.0727E+00 −7.0850E−01  2.3911E−01 −6.0440E−03 1.5069E−01  3.0396E−01 A8 =  1.0925E+00  6.4357E−01 −3.8765E−01−7.3126E−02 −5.0148E−03 −1.7108E−01 A10 = −5.5497E−01 −2.6033E−01 3.6662E−01  8.2995E−02 −9.7713E−04  7.3393E−02 A12 = −8.0327E−02−6.6144E−02 −1.9585E−01 −4.1545E−02 −7.2214E−03 −2.2300E−02 A14 = 1.8020E−01  9.9468E−02  5.2623E−02  1.1450E−02  4.0566E−03  4.4878E−03A16 = −4.4207E−02 −3.0673E−02 −3.7941E−03 −1.7983E−03 −9.4247E−04−5.6251E−04 A18 = —  2.8446E−03 −1.0112E−03  1.5142E−04  1.0521E−04 3.9670E−05 A20 = — —  1.5646E−04 −5.3587E−06 −4.6672E−06 −1.2011E−06

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 3.87 TD/CT1 3.76 Fno 2.25 TL/f 1.22 HFOV [deg.]39.2 TL/ImgH 1.45 Nmax 1.669 (R1 + R2)/(R1 − R2) −0.12 (Vi/Ni)min 11.65R10/R9 1.55 V2 + V3 + V4 67.1 Σ|f/fi| 3.95 Vmin 19.5 |f/f3| + |f/f4|0.13 ΣCT/ΣAT 2.26 f/R1 1.70 CT1/CT2 3.79 EPD/CT1 1.79 CT1/CT5 2.61ET1/ET2 1.82 CT1/(CT2 + CT3) 1.96 Y11/CT1 0.90 CT1/(CT2 + T23 + CT3)1.31 Y11/ET1 1.27 CT1/ET1 1.42 Y62/Y11 2.73 (CT5 + CT6)/T56 1.74Yc51/Yc52 1.04 CT5/CT4 1.05 Yc62/Y62 0.42

11th Embodiment

FIG. 21 is a perspective view of an image capturing unit according tothe 11th embodiment of the present disclosure. In this embodiment, animage capturing unit 10 is a camera module including a lens unit 11, adriving device 12, an image sensor 13 and an image stabilizer 14. Thelens unit 11 includes the photographing optical lens system disclosed inthe 1st embodiment, a barrel and a holder member (their referencenumerals are omitted) for holding the photographing optical lens system.The imaging light converges in the lens unit 11 of the image capturingunit 10 to generate an image with the driving device 12 utilized forimage focusing on the image sensor 13, and the generated image is thendigitally transmitted to other electronic component for furtherprocessing.

The driving device 12 can have auto focusing functionality, anddifferent driving configurations can be obtained through the usages ofvoice coil motors (VCM), micro electro-mechanical systems (MEMS),piezoelectric systems, or shape memory alloy materials. The drivingdevice 12 is favorable for obtaining a better imaging position of thelens unit 11, so that a clear image of the imaged object can be capturedby the lens unit 11 with different object distances. The image sensor 13(for example, CCD or CMOS), which can feature high photosensitivity andlow noise, is disposed on the image surface of the photographing opticallens system to provide higher image quality.

The image stabilizer 14, such as an accelerometer, a gyro sensor and aHall Effect sensor, is configured to work with the driving device 12 toprovide optical image stabilization (OIS). The driving device 12 workingwith the image stabilizer 14 is favorable for compensating for pan andtilt of the lens unit 11 to reduce blurring associated with motionduring exposure. In some cases, the compensation can be provided byelectronic image stabilization (EIS) with image processing software,thereby improving image quality while in motion or low-light conditions.

12th Embodiment

FIG. 22 is one perspective view of an electronic device according to the12th embodiment of the present disclosure. FIG. 23 is anotherperspective view of the electronic device in FIG. 22. FIG. 24 is a blockdiagram of the electronic device in FIG. 22.

In this embodiment, an electronic device 20 is a smartphone includingthe image capturing unit 10 disclosed in the 11th embodiment, an imagecapturing unit 10 a, an image capturing unit 10 b, an image capturingunit 10 c, a flash module 21, a focus assist module 22, an image signalprocessor 23, a user interface 24 and an image software processor 25.The image capturing unit 10 c is located on the same side as the userinterface 24, and the image capturing unit 10 c is a front-facing cameraof the electronic device 20 for taking selfies. The image capturing unit10, the image capturing unit 10 a and the image capturing unit 10 b arelocated on the opposite side and all face the same direction.Furthermore, each of the image capturing unit 10 a, the image capturingunit 10 b and the image capturing unit 10 c has a configuration similarto that of the image capturing unit 10. In detail, each of the imagecapturing unit 10 a, the image capturing unit 10 b and the imagecapturing unit 10 c includes a lens unit, a driving device, an imagesensor and an image stabilizer, and the lens unit includes a lens systemassembly, a barrel and a holder member for holding the lens systemassembly. In addition, the lens system assembly of the image capturingunit 10 c is the photographing optical lens system disclosed in the 1stembodiment.

In this embodiment, the image capturing unit 10 a is a telephoto imagecapturing unit, the image capturing unit 10 b is an ultra-wide-angleimage capturing unit and the image capturing unit 10 has a maximum fieldof view ranging between that of the image capturing unit 10 a and thatof the image capturing unit 10 b. The image capturing units 10, 10 a and10 b have different fields of view, such that the electronic device 20has various magnification ratios so as to meet the requirement ofoptical zoom functionality. In this embodiment, the electronic device 20includes multiple image capturing units 10, 10 a, 10 b and 10 c, but thepresent disclosure is not limited to the number and arrangement of imagecapturing units.

When a user captures images of an object 26, the light rays converge inthe image capturing unit 10, the image capturing unit 10 a or the imagecapturing unit 10 b to generate an image(s), and the flash module 21 isactivated for light supplement. The focus assist module 22 detects theobject distance of the imaged object 26 to achieve fast auto focusing.The image signal processor 23 is configured to optimize the capturedimage to improve image quality. The light beam emitted from the focusassist module 22 can be either conventional infrared or laser. Inaddition, the electronic device 20 can capture images of the object 26via the image capturing unit 10 c. The user interface 24 can be a touchscreen or a physical button. The user is able to interact with the userinterface 24 and the image software processor 25 having multiplefunctions to capture images and complete image processing. The imageprocessed by the image software processor 25 can be displayed on theuser interface 24.

The smartphone in this embodiment is only exemplary for showing theimage capturing unit 10 of the present disclosure installed in anelectronic device, and the present disclosure is not limited thereto.The image capturing unit 10 can be optionally applied to optical systemswith a movable focus. Furthermore, the photographing optical lens systemof the image capturing unit 10 features good capability in aberrationcorrections and high image quality, and can be applied to 3D(three-dimensional) image capturing applications, in products such asdigital cameras, mobile devices, digital tablets, smart televisions,network surveillance devices, dashboard cameras, vehicle backup cameras,multi-camera devices, image recognition systems, motion sensing inputdevices, wearable devices and other electronic imaging devices.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-20 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. A photographing optical lens system comprisingsix lens elements, the six lens elements being, in order from an objectside to an image side, a first lens element, a second lens element, athird lens element, a fourth lens element, a fifth lens element and asixth lens element, and each of the six lens elements having anobject-side surface facing toward the object side and an image-sidesurface facing toward the image side; wherein the first lens element haspositive refractive power, the second lens element has negativerefractive power, the image-side surface of the fifth lens element isconcave in a paraxial region thereof, the sixth lens element hasnegative refractive power, and at least one lens surface of at least onelens element of the photographing optical lens system has at least onecritical point in an off-axis region thereof; wherein an Abbe number ofthe second lens element is V2, an Abbe number of the third lens elementis V3, an Abbe number of the fourth lens element is V4, a centralthickness of the first lens element is CT1, a central thickness of thesecond lens element is CT2, a central thickness of the third lenselement is CT3, a central thickness of the fifth lens element is CTS, acentral thickness of the sixth lens element is CT6, an axial distancebetween the second lens element and the third lens element is T23, anaxial distance between the fifth lens element and the sixth lens elementis T56, half of a maximum field of view of the photographing opticallens system is HFOV, and the following conditions are satisfied:30.0<V2+V3+V4<90.0;1.00<CT1/(CT2+T23+CT3);30.0 [deg.]<HFOV; and(CT5+CT6)/T56<10.0.
 2. The photographing optical lens system of claim 1,wherein the Abbe number of the second lens element is V2, the Abbenumber of the third lens element is V3, the Abbe number of the fourthlens element is V4, the central thickness of the first lens element isCT1, the central thickness of the second lens element is CT2, thecentral thickness of the third lens element is CT3, the axial distancebetween the second lens element and the third lens element is T23, andthe following conditions are satisfied:40.0<V2+V3+V4<85.0; and1.10<CT1/(CT2+T23+CT3)<2.40.
 3. The photographing optical lens system ofclaim 1, wherein half of the maximum field of view of the photographingoptical lens system is HFOV, the central thickness of the fifth lenselement is CT5, the central thickness of the sixth lens element is CT6,the axial distance between the fifth lens element and the sixth lenselement is T56, and the following conditions are satisfied:35.0 [deg.]<HFOV<45.0 [deg.]; and0.60<(CT5+CT6)/T56<6.0.
 4. The photographing optical lens system ofclaim 1, wherein an Abbe number of the first lens element is V1, theAbbe number of the second lens element is V2, the Abbe number of thethird lens element is V3, the Abbe number of the fourth lens element isV4, an Abbe number of the fifth lens element is V5, an Abbe number ofthe sixth lens element is V6, an Abbe number of the i-th lens element isVi, a refractive index of the first lens element is N1, a refractiveindex of the second lens element is N2, a refractive index of the thirdlens element is N3, a refractive index of the fourth lens element is N4,a refractive index of the fifth lens element is N5, a refractive indexof the sixth lens element is N6, a refractive index of the i-th lenselement is Ni, a minimum value of Vi/Ni is (Vi/Ni)min, a maximumeffective radius of the object-side surface of the first lens element isY11, a maximum effective radius of the image-side surface of the sixthlens element is Y62, and the following conditions are satisfied:6.0<(Vi/Ni)min<12.0, wherein i=1, 2, 3, 4, 5 or 6; and2.2<Y62/Y11<5.0.
 5. The photographing optical lens system of claim 1,wherein a focal length of the photographing optical lens system is f, afocal length of the first lens element is f1, a focal length of thesecond lens element is f2, a focal length of the third lens element isf3, a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, a focal length of the sixth lens elementis f6, a focal length of the i-th lens element is fi, an f-number of thephotographing optical lens system is Fno, and the following conditionsare satisfied:Σ|f/fi|<5.0, wherein i=1, 2, 3, 4, 5 and 6; and1.70<Fno<2.50.
 6. The photographing optical lens system of claim 1,wherein the central thickness of the first lens element is CT1, thecentral thickness of the second lens element is CT2, a distance inparallel with an optical axis between a maximum effective radiusposition of the object-side surface of the first lens element and amaximum effective radius position of the image-side surface of the firstlens element is ET1, and the following conditions are satisfied:3.5<CT1/CT2<10; and1.10<CT1/ET1<1.80.
 7. The photographing optical lens system of claim 1,wherein the object-side surface of the fifth lens element is convex in aparaxial region thereof, a curvature radius of the object-side surfaceof the fifth lens element is R9, a curvature radius of the image-sidesurface of the fifth lens element is R10, and the following condition issatisfied:0.50<R10/R9<2.2; wherein a vertical distance between a non-axialcritical point on the object-side surface of the fifth lens element andan optical axis is Yc51, a vertical distance between a non-axialcritical point on the image-side surface of the fifth lens element andthe optical axis is Yc52, and the object-side surface and the image-sidesurface of the fifth lens element each have at least one critical pointin an off-axis region thereof satisfying the following condition:0.70<Yc51/Yc52<1.4.
 8. A photographing optical lens system comprisingsix lens elements, the six lens elements being, in order from an objectside to an image side, a first lens element, a second lens element, athird lens element, a fourth lens element, a fifth lens element and asixth lens element, and each of the six lens elements having anobject-side surface facing toward the object side and an image-sidesurface facing toward the image side; wherein the first lens element haspositive refractive power, the image-side surface of the first lenselement is convex in a paraxial region thereof, the second lens elementhas negative refractive power, the sixth lens element has negativerefractive power, and at least one lens surface of at least one lenselement of the photographing optical lens system has at least onecritical point in an off-axis region thereof; wherein an Abbe number ofthe second lens element is V2, an Abbe number of the third lens elementis V3, an Abbe number of the fourth lens element is V4, a centralthickness of the first lens element is CT1, a central thickness of thesecond lens element is CT2, a central thickness of the third lenselement is CT3, a central thickness of the fourth lens element is CT4, acentral thickness of the fifth lens element is CTS, an axial distancebetween the second lens element and the third lens element is T23, halfof a maximum field of view of the photographing optical lens system isHFOV, and the following conditions are satisfied:30.0<V2+V3+V4<90.0;1.00<CT1/(CT2+T23+CT3);30.0 [deg.]<HFOV; andCT5/CT4<1.80.
 9. The photographing optical lens system of claim 8,wherein the Abbe number of the second lens element is V2, the Abbenumber of the third lens element is V3, the Abbe number of the fourthlens element is V4, half of the maximum field of view of thephotographing optical lens system is HFOV, and the following conditionsare satisfied:40.0<V2+V3+V4<85.0; and35.0 [deg.]<HFOV<45.0 [deg.].
 10. The photographing optical lens systemof claim 8, wherein the central thickness of the first lens element isCT1, the central thickness of the fourth lens element is CT4, thecentral thickness of the fifth lens element is CT5, an axial distancebetween the object-side surface of the first lens element and theimage-side surface of the sixth lens element is TD, and the followingconditions are satisfied:0.60<CT5/CT4<1.55; and2.5<TD/CT1<5.0.
 11. The photographing optical lens system of claim 8,wherein an entrance pupil diameter of the photographing optical lenssystem is EPD, the central thickness of the first lens element is CT1,and the following condition is satisfied:1.4<EPD/CT1<2.5.
 12. The photographing optical lens system of claim 8,wherein a maximum effective radius of the object-side surface of thefirst lens element is Y11, a distance in parallel with an optical axisbetween a maximum effective radius position of the object-side surfaceof the first lens element and a maximum effective radius position of theimage-side surface of the first lens element is ET1, and the followingcondition is satisfied:0.80<Y11/ET1<2.2.
 13. The photographing optical lens system of claim 8,wherein the object-side surface of the first lens element is convex in aparaxial region thereof, the image-side surface of the sixth lenselement is concave in a paraxial region thereof, a focal length of thephotographing optical lens system is f, a curvature radius of theobject-side surface of the first lens element is R1, and the followingcondition is satisfied:1.0<f/R1<2.0; wherein a vertical distance between a non-axial criticalpoint on the image-side surface of the sixth lens element and an opticalaxis is Yc62, a maximum effective radius of the image-side surface ofthe sixth lens element is Y62, and the image-side surface of the sixthlens element has at least one critical point in an off-axis regionthereof satisfying the following condition:0.15<Yc62/Y62<0.65.
 14. A photographing optical lens system comprisingsix lens elements, the six lens elements being, in order from an objectside to an image side, a first lens element, a second lens element, athird lens element, a fourth lens element, a fifth lens element and asixth lens element, and each of the six lens elements having anobject-side surface facing toward the object side and an image-sidesurface facing toward the image side; wherein the first lens element haspositive refractive power, the second lens element has negativerefractive power, the sixth lens element has negative refractive power,and at least one lens surface of at least one lens element of thephotographing optical lens system has at least one critical point in anoff-axis region thereof; wherein an Abbe number of the second lenselement is V2, an Abbe number of the third lens element is V3, an Abbenumber of the fourth lens element is V4, a central thickness of thefirst lens element is CT1, a central thickness of the second lenselement is CT2, a central thickness of the third lens element is CT3, acentral thickness of the fourth lens element is CT4, a central thicknessof the fifth lens element is CTS, an axial distance between the secondlens element and the third lens element is T23, half of a maximum fieldof view of the photographing optical lens system is HFOV, and thefollowing conditions are satisfied:30.0<V2+V3+V4<90.0;1.00<CT1/(CT2+T23+CT3);35.0 [deg.]<HFOV; andCT5/CT4<1.35.
 15. The photographing optical lens system of claim 14,wherein the Abbe number of the second lens element is V2, the Abbenumber of the third lens element is V3, the Abbe number of the fourthlens element is V4, a minimum value among Abbe numbers of all lenselements of the photographing optical lens system is Vmin, a maximumvalue among refractive indices of all lens elements of the photographingoptical lens system is Nmax, and the following conditions are satisfied:40.0<V2+V3+V4<85.0;10.0<Vmin<20.0; and1.66<Nmax<1.75.
 16. The photographing optical lens system of claim 14,wherein the central thickness of the first lens element is CT1, thecentral thickness of the second lens element is CT2, the centralthickness of the third lens element is CT3, the axial distance betweenthe second lens element and the third lens element is T23, and thefollowing conditions are satisfied:1.10<CT1/(CT2+T23+CT3)<2.00; and1.5<CT1/(CT2+CT3)<5.0.
 17. The photographing optical lens system ofclaim 14, wherein the central thickness of the first lens element isCT1, the central thickness of the fourth lens element is CT4, thecentral thickness of the fifth lens element is CT5, and the followingconditions are satisfied:0.75<CT5/CT4<1.25; and1.8<CT1/CT5<3.2.
 18. The photographing optical lens system of claim 14,wherein a curvature radius of the object-side surface of the first lenselement is R1, a curvature radius of the image-side surface of the firstlens element is R2, and the following condition is satisfied:−0.75<(R1+R2)/(R1−R2)<0.
 19. The photographing optical lens system ofclaim 14, wherein a sum of central thicknesses of all lens elements ofthe photographing optical lens system is ΣCT, a sum of axial distancesbetween each of all adjacent lens elements of the photographing opticallens system is ΣAT, a distance in parallel with an optical axis betweena maximum effective radius position of the object-side surface of thefirst lens element and a maximum effective radius position of theimage-side surface of the first lens element is ET1, a distance inparallel with the optical axis between a maximum effective radiusposition of the object-side surface of the second lens element and amaximum effective radius position of the image-side surface of thesecond lens element is ET2, and the following conditions are satisfied:1.50<ΣCT/ΣAT<3.50; and1.2<ET1/ET2<6.0.
 20. The photographing optical lens system of claim 14,wherein at least one lens surface of each of at least two lens elementsof the photographing optical lens system has at least one inflectionpoint, a maximum effective radius of the object-side surface of thefirst lens element is Y11, the central thickness of the first lenselement is CT1, and the following condition is satisfied:0.70<Y11/CT1<1.2.
 21. The photographing optical lens system of claim 14,further comprising an aperture stop, wherein the aperture stop isdisposed between the first lens element and an imaged object, an axialdistance between the object-side surface of the first lens element andan image surface is TL, a focal length of the photographing optical lenssystem is f, a maximum image height of the photographing optical lenssystem is ImgH, and the following conditions are satisfied:1.05<TL/f<1.50; and1.0<TL/ImgH<1.6.
 22. The photographing optical lens system of claim 14,wherein the object-side surface of the third lens element is convex in aparaxial region thereof, the image-side surface of the third lenselement is concave in a paraxial region thereof, the object-side surfaceof the fourth lens element is concave in a paraxial region thereof, theimage-side surface of the fourth lens element is convex in a paraxialregion thereof, a focal length of the photographing optical lens systemis f, a focal length of the third lens element is f3, a focal length ofthe fourth lens element is f4, and the following condition is satisfied:|f/f3|+|f/f4|<0.70.
 23. An image capturing unit, comprising: thephotographing optical lens system of claim 14; and an image sensordisposed on an image surface of the photographing optical lens system.24. An electronic device, comprising: the image capturing unit of claim23.